221021001211212 has 72 divisors (see below), whose sum is σ = 579707137691136. Its totient is φ = 70943492127744.

The previous prime is 221021001211181. The next prime is 221021001211253. The reversal of 221021001211212 is 212112100120122.

221021001211212 is a `hidden beast` number, since 2 + 210 + 210 + 0 + 121 + 121 + 2 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 855188748 + ... + 855447155.

It is an arithmetic number, because the mean of its divisors is an integer number (8051488023488).

Almost surely, 2^{221021001211212} is an apocalyptic number.

It is an amenable number.

221021001211212 is an abundant number, since it is smaller than the sum of its proper divisors (358686136479924).

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

221021001211212 is a wasteful number, since it uses less digits than its factorization.

221021001211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710636047 (or 1710636042 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221021001211212 its reverse (212112100120122), we get a palindrome (433133101331334).

The spelling of 221021001211212 in words is "two hundred twenty-one trillion, twenty-one billion, one million, two hundred eleven thousand, two hundred twelve".