21111212914 has 24 divisors (see below), whose sum is σ = 35748084204. Its totient is φ = 9336650400.

The previous prime is 21111212839. The next prime is 21111212933. The reversal of 21111212914 is 41921211112.

It can be written as a sum of positive squares in 2 ways, for example, as 18261468225 + 2849744689 = 135135^2 + 53383^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1169917 + ... + 1187824.

Almost surely, 2^21111212914 is an apocalyptic number.

21111212914 is a deficient number, since it is larger than the sum of its proper divisors (14636871290).

21111212914 is a wasteful number, since it uses less digits than its factorization.

21111212914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357802 (or 2357791 counting only the distinct ones).

The product of its digits is 288, while the sum is 25.

The spelling of 21111212914 in words is "twenty-one billion, one hundred eleven million, two hundred twelve thousand, nine hundred fourteen".