221211211012212 has 24 divisors (see below), whose sum is σ = 516181535102016. Its totient is φ = 73733921374528.

The previous prime is 221211211012153. The next prime is 221211211012223. The reversal of 221211211012212 is 212210112112122.

221211211012212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221211211012212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393327648 + ... + 393889655.

It is an arithmetic number, because the mean of its divisors is an integer number (21507563962584).

Almost surely, 2^{221211211012212} is an apocalyptic number.

It is an amenable number.

221211211012212 is an abundant number, since it is smaller than the sum of its proper divisors (294970324089804).

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

221211211012212 is a wasteful number, since it uses less digits than its factorization.

221211211012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787240727 (or 787240725 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221211211012212 its reverse (212210112112122), we get a palindrome (433421323124334).

The spelling of 221211211012212 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred eleven million, twelve thousand, two hundred twelve".