21516085396 has 24 divisors (see below), whose sum is σ = 40636421280. Its totient is φ = 9909225312.

The previous prime is 21516085387. The next prime is 21516085403. The reversal of 21516085396 is 69358061512.

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, 418726 + ... + 467293.

It is an arithmetic number, because the mean of its divisors is an integer number (1693184220).

Almost surely, 2^21516085396 is an apocalyptic number.

21516085396 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21516085396 is a deficient number, since it is larger than the sum of its proper divisors (19120335884).

21516085396 is a wasteful number, since it uses less digits than its factorization.

21516085396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886503 (or 886501 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 21516085396 in words is "twenty-one billion, five hundred sixteen million, eighty-five thousand, three hundred ninety-six".