21163145066531 has 8 divisors (see below), whose sum is σ = 23177368782960. Its totient is φ = 19204105561632.

The previous prime is 21163145066519. The next prime is 21163145066563. The reversal of 21163145066531 is 13566054136112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21163145066531 - 2¹⁴ = 21163145050147 is a prime.

It is a super-2 number, since 2×21163145066531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21163145026531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13796052080 + ... + 13796053613.

It is an arithmetic number, because the mean of its divisors is an integer number (2897171097870).

Almost surely, 2^{21163145066531} is an apocalyptic number.

21163145066531 is a deficient number, since it is larger than the sum of its proper divisors (2014223716429).

21163145066531 is a wasteful number, since it uses less digits than its factorization.

21163145066531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27592105765.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 21163145066531 in words is "twenty-one trillion, one hundred sixty-three billion, one hundred forty-five million, sixty-six thousand, five hundred thirty-one".