21010000222221 has 32 divisors (see below), whose sum is σ = 29767282272000. Its totient is φ = 13135617838080.

The previous prime is 21010000222157. The next prime is 21010000222241. The reversal of 21010000222221 is 12222200001012.

It is not a de Polignac number, because 21010000222221 - 2⁶ = 21010000222157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010000222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010000222241) 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, 43998855 + ... + 44473803.

It is an arithmetic number, because the mean of its divisors is an integer number (930227571000).

Almost surely, 2^{21010000222221} is an apocalyptic number.

It is an amenable number.

21010000222221 is a deficient number, since it is larger than the sum of its proper divisors (8757282049779).

21010000222221 is a wasteful number, since it uses less digits than its factorization.

21010000222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478069.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21010000222221 its reverse (12222200001012), we get a palindrome (33232200223233).

The spelling of 21010000222221 in words is "twenty-one trillion, ten billion, two hundred twenty-two thousand, two hundred twenty-one".