21150216162315 has 32 divisors (see below), whose sum is σ = 37972665345600. Its totient is φ = 11168430969600.

The previous prime is 21150216162253. The next prime is 21150216162331. The reversal of 21150216162315 is 51326161205112.

21150216162315 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 0 + 2 + 1 + 616 + 2 + 31 + 5 = 666.

It is not a de Polignac number, because 21150216162315 - 2¹² = 21150216158219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21150216162315.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 775571850 + ... + 775599119.

It is an arithmetic number, because the mean of its divisors is an integer number (1186645792050).

Almost surely, 2^{21150216162315} is an apocalyptic number.

21150216162315 is a deficient number, since it is larger than the sum of its proper divisors (16822449183285).

21150216162315 is a wasteful number, since it uses less digits than its factorization.

21150216162315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551171084 (or 1551171078 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

Adding to 21150216162315 its reverse (51326161205112), we get a palindrome (72476377367427).

The spelling of 21150216162315 in words is "twenty-one trillion, one hundred fifty billion, two hundred sixteen million, one hundred sixty-two thousand, three hundred fifteen".