213220211220 has 96 divisors (see below), whose sum is σ = 698265052800. Its totient is φ = 53866156032.

The previous prime is 213220211213. The next prime is 213220211231. The reversal of 213220211220 is 22112022312.

213220211220 is a `hidden beast` number, since 2 + 13 + 220 + 211 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 213220211193 and 213220211202.

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 31 ways as a sum of consecutive naturals, for example, 10380589 + ... + 10401108.

It is an arithmetic number, because the mean of its divisors is an integer number (7273594300).

Almost surely, 2^213220211220 is an apocalyptic number.

213220211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213220211220 is an abundant number, since it is smaller than the sum of its proper divisors (485044841580).

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

213220211220 is a wasteful number, since it uses less digits than its factorization.

213220211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20781734 (or 20781726 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 213220211220 its reverse (22112022312), we get a palindrome (235332233532).

The spelling of 213220211220 in words is "two hundred thirteen billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty".