21150015432017 has 16 divisors (see below), whose sum is σ = 21418645248000. Its totient is φ = 20883142455120.

The previous prime is 21150015431989. The next prime is 21150015432023. The reversal of 21150015432017 is 71023451005112.

It is a cyclic number.

It is not a de Polignac number, because 21150015432017 - 2²⁰ = 21150014383441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21150015492017) 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, 63093542 + ... + 63427872.

It is an arithmetic number, because the mean of its divisors is an integer number (1338665328000).

Almost surely, 2^{21150015432017} is an apocalyptic number.

It is an amenable number.

21150015432017 is a deficient number, since it is larger than the sum of its proper divisors (268629815983).

21150015432017 is a wasteful number, since it uses less digits than its factorization.

21150015432017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336956.

The product of its (nonzero) digits is 8400, while the sum is 32.

Adding to 21150015432017 its reverse (71023451005112), we get a palindrome (92173466437129).

The spelling of 21150015432017 in words is "twenty-one trillion, one hundred fifty billion, fifteen million, four hundred thirty-two thousand, seventeen".