213222211220 has 12 divisors (see below), whose sum is σ = 447766643604. Its totient is φ = 85288884480.

The previous prime is 213222211219. The next prime is 213222211243. The reversal of 213222211220 is 22112222312.

It can be written as a sum of positive squares in 2 ways, for example, as 124401522436 + 88820688784 = 352706^2 + 298028^2 .

It is a super-2 number, since 2×213222211220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10661110561 = 213222211220 / (2 + 1 + 3 + 2 + 2 + 2 + 2 + 1 + 1 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 213222211192 and 213222211201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5330555261 + ... + 5330555300.

It is an arithmetic number, because the mean of its divisors is an integer number (37313886967).

Almost surely, 2^213222211220 is an apocalyptic number.

213222211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213222211220 is an abundant number, since it is smaller than the sum of its proper divisors (234544432384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213222211220 is a wasteful number, since it uses less digits than its factorization.

213222211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661110570 (or 10661110568 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 213222211220 its reverse (22112222312), we get a palindrome (235334433532).

The spelling of 213222211220 in words is "two hundred thirteen billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty".