21513214899 has 32 divisors (see below), whose sum is σ = 35358163200. Its totient is φ = 12817313280.

The previous prime is 21513214897. The next prime is 21513214967. The reversal of 21513214899 is 99841231512.

21513214899 is a `hidden beast` number, since 2 + 1 + 513 + 2 + 1 + 48 + 99 = 666.

It is not a de Polignac number, because 21513214899 - 2¹ = 21513214897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21513214897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 596334 + ... + 631379.

It is an arithmetic number, because the mean of its divisors is an integer number (1104942600).

Almost surely, 2^21513214899 is an apocalyptic number.

21513214899 is a deficient number, since it is larger than the sum of its proper divisors (13844948301).

21513214899 is a wasteful number, since it uses less digits than its factorization.

21513214899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227792 (or 1227786 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The spelling of 21513214899 in words is "twenty-one billion, five hundred thirteen million, two hundred fourteen thousand, eight hundred ninety-nine".