21111112211010 has 64 divisors (see below), whose sum is σ = 53081691254784. Its totient is φ = 5366715076800.

The previous prime is 21111112210913. The next prime is 21111112211017. The reversal of 21111112211010 is 1011221111112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21111112211017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169341576 + ... + 169466195.

It is an arithmetic number, because the mean of its divisors is an integer number (829401425856).

Almost surely, 2^{21111112211010} is an apocalyptic number.

21111112211010 is an abundant number, since it is smaller than the sum of its proper divisors (31970579043774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111112211010 is a wasteful number, since it uses less digits than its factorization.

21111112211010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338807879.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21111112211010 its reverse (1011221111112), we get a palindrome (22122333322122).

The spelling of 21111112211010 in words is "twenty-one trillion, one hundred eleven billion, one hundred twelve million, two hundred eleven thousand, ten".