21012110202221 has 64 divisors (see below), whose sum is σ = 22617584640000. Its totient is φ = 19463933926656.

The previous prime is 21012110202203. The next prime is 21012110202257. The reversal of 21012110202221 is 12220201121012.

It is a cyclic number.

It is not a de Polignac number, because 21012110202221 - 2⁶ = 21012110202157 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 21012110202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012110202121) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 42108437030 + ... + 42108437528.

It is an arithmetic number, because the mean of its divisors is an integer number (353399760000).

Almost surely, 2^{21012110202221} is an apocalyptic number.

It is an amenable number.

21012110202221 is a deficient number, since it is larger than the sum of its proper divisors (1605474437779).

21012110202221 is a wasteful number, since it uses less digits than its factorization.

21012110202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012110202221 its reverse (12220201121012), we get a palindrome (33232311323233).

The spelling of 21012110202221 in words is "twenty-one trillion, twelve billion, one hundred ten million, two hundred two thousand, two hundred twenty-one".