221212220101220 has 48 divisors (see below), whose sum is σ = 490056161918400. Its totient is φ = 83645949582720.

The previous prime is 221212220101199. The next prime is 221212220101253. The reversal of 221212220101220 is 22101022212122.

It is a super-2 number, since 2×221212220101220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221212220101192 and 221212220101201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 631210310 + ... + 631560669.

It is an arithmetic number, because the mean of its divisors is an integer number (10209503373300).

Almost surely, 2^{221212220101220} is an apocalyptic number.

221212220101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212220101220 is an abundant number, since it is smaller than the sum of its proper divisors (268843941817180).

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

221212220101220 is a wasteful number, since it uses less digits than its factorization.

221212220101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262771468 (or 1262771466 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221212220101220 its reverse (22101022212122), we get a palindrome (243313242313342).

The spelling of 221212220101220 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred twenty million, one hundred one thousand, two hundred twenty".