21211212110 has 32 divisors (see below), whose sum is σ = 41657652864. Its totient is φ = 7711956000.

The previous prime is 21211212109. The next prime is 21211212133. The reversal of 21211212110 is 1121211212.

It is a congruent number.

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, 989405 + ... + 1010615.

It is an arithmetic number, because the mean of its divisors is an integer number (1301801652).

Almost surely, 2^21211212110 is an apocalyptic number.

21211212110 is a deficient number, since it is larger than the sum of its proper divisors (20446440754).

21211212110 is a wasteful number, since it uses less digits than its factorization.

21211212110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30320.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21211212110 its reverse (1121211212), we get a palindrome (22332423322).

The spelling of 21211212110 in words is "twenty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred ten".