21112011010221 has 64 divisors (see below), whose sum is σ = 29140435230720. Its totient is φ = 13590456721920.

The previous prime is 21112011010213. The next prime is 21112011010229. The reversal of 21112011010221 is 12201011021112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21112011010213) and next prime (21112011010229).

It is not a de Polignac number, because 21112011010221 - 2³ = 21112011010213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112011010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112011010229) 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, 3497100015 + ... + 3497106051.

It is an arithmetic number, because the mean of its divisors is an integer number (455319300480).

Almost surely, 2^{21112011010221} is an apocalyptic number.

It is an amenable number.

21112011010221 is a deficient number, since it is larger than the sum of its proper divisors (8028424220499).

21112011010221 is a wasteful number, since it uses less digits than its factorization.

21112011010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7866.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21112011010221 its reverse (12201011021112), we get a palindrome (33313022031333).

The spelling of 21112011010221 in words is "twenty-one trillion, one hundred twelve billion, eleven million, ten thousand, two hundred twenty-one".