21150512405 has 16 divisors (see below), whose sum is σ = 27691058304. Its totient is φ = 15380460480.

The previous prime is 21150512401. The next prime is 21150512407. The reversal of 21150512405 is 50421505112.

It is not a de Polignac number, because 21150512405 - 2² = 21150512401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150512401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 672287 + ... + 703043.

It is an arithmetic number, because the mean of its divisors is an integer number (1730691144).

Almost surely, 2^21150512405 is an apocalyptic number.

It is an amenable number.

21150512405 is a deficient number, since it is larger than the sum of its proper divisors (6540545899).

21150512405 is a wasteful number, since it uses less digits than its factorization.

21150512405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43276.

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 21150512405 in words is "twenty-one billion, one hundred fifty million, five hundred twelve thousand, four hundred five".