21150015432016 has 20 divisors (see below), whose sum is σ = 41555312013024. Its totient is φ = 10426063944800.

The previous prime is 21150015431989. The next prime is 21150015432023. The reversal of 21150015432016 is 61023451005112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9308984530 + ... + 9308986801.

Almost surely, 2^{21150015432016} is an apocalyptic number.

It is an amenable number.

21150015432016 is a deficient number, since it is larger than the sum of its proper divisors (20405296581008).

21150015432016 is a wasteful number, since it uses less digits than its factorization.

21150015432016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18617971410 (or 18617971404 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 21150015432016 its reverse (61023451005112), we get a palindrome (82173466437128).

The spelling of 21150015432016 in words is "twenty-one trillion, one hundred fifty billion, fifteen million, four hundred thirty-two thousand, sixteen".