21102012010 has 32 divisors (see below), whose sum is σ = 38750234112. Its totient is φ = 8270857920.

The previous prime is 21102011999. The next prime is 21102012031. The reversal of 21102012010 is 1021020112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391815 + ... + 442405.

It is an arithmetic number, because the mean of its divisors is an integer number (1210944816).

Almost surely, 2^21102012010 is an apocalyptic number.

21102012010 is a deficient number, since it is larger than the sum of its proper divisors (17648222102).

21102012010 is a wasteful number, since it uses less digits than its factorization.

21102012010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51438.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21102012010 its reverse (1021020112), we get a palindrome (22123032122).

The spelling of 21102012010 in words is "twenty-one billion, one hundred two million, twelve thousand, ten".