21213111110 has 16 divisors (see below), whose sum is σ = 39500276400. Its totient is φ = 8192649696.

The previous prime is 21213111109. The next prime is 21213111121. The reversal of 21213111110 is 1111131212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36574040 + ... + 36574619.

It is an arithmetic number, because the mean of its divisors is an integer number (2468767275).

Almost surely, 2^21213111110 is an apocalyptic number.

21213111110 is a deficient number, since it is larger than the sum of its proper divisors (18287165290).

21213111110 is a wasteful number, since it uses less digits than its factorization.

21213111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73148695.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21213111110 its reverse (1111131212), we get a palindrome (22324242322).

The spelling of 21213111110 in words is "twenty-one billion, two hundred thirteen million, one hundred eleven thousand, one hundred ten".