21111100010 has 128 divisors (see below), whose sum is σ = 51189594624. Its totient is φ = 6053852160.

The previous prime is 21111100007. The next prime is 21111100033. The reversal of 21111100010 is 1000111112.

It is a happy number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 3169844 + ... + 3176496.

It is an arithmetic number, because the mean of its divisors is an integer number (399918708).

Almost surely, 2^21111100010 is an apocalyptic number.

21111100010 is an abundant number, since it is smaller than the sum of its proper divisors (30078494614).

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

21111100010 is a wasteful number, since it uses less digits than its factorization.

21111100010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7008.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21111100010 its reverse (1000111112), we get a palindrome (22111211122).

It can be divided in two parts, 21111 and 100010, that added together give a palindrome (121121).

The spelling of 21111100010 in words is "twenty-one billion, one hundred eleven million, one hundred thousand, ten".