221021000120212 has 24 divisors (see below), whose sum is σ = 389353389518016. Its totient is φ = 109778026758528.

The previous prime is 221021000120203. The next prime is 221021000120227. The reversal of 221021000120212 is 212021000120122.

It is a happy number.

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, 105488598 + ... + 107563405.

It is an arithmetic number, because the mean of its divisors is an integer number (16223057896584).

Almost surely, 2^{221021000120212} is an apocalyptic number.

It is an amenable number.

221021000120212 is a deficient number, since it is larger than the sum of its proper divisors (168332389397804).

221021000120212 is a wasteful number, since it uses less digits than its factorization.

221021000120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213053727 (or 213053725 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221021000120212 its reverse (212021000120122), we get a palindrome (433042000240334).

The spelling of 221021000120212 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty thousand, two hundred twelve".