21112012222021 has 32 divisors (see below), whose sum is σ = 25303364640000. Its totient is φ = 17231692101120.

The previous prime is 21112012222001. The next prime is 21112012222031. The reversal of 21112012222021 is 12022221021112.

It is not a de Polignac number, because 21112012222021 - 2¹¹ = 21112012219973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112012222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112012222001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387356230 + ... + 387410728.

It is an arithmetic number, because the mean of its divisors is an integer number (790730145000).

Almost surely, 2^{21112012222021} is an apocalyptic number.

It is an amenable number.

21112012222021 is a deficient number, since it is larger than the sum of its proper divisors (4191352417979).

21112012222021 is a wasteful number, since it uses less digits than its factorization.

21112012222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80749.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21112012222021 its reverse (12022221021112), we get a palindrome (33134233243133).

The spelling of 21112012222021 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-two thousand, twenty-one".