21153352917 has 16 divisors (see below), whose sum is σ = 29673266112. Its totient is φ = 13386430080.

The previous prime is 21153352901. The next prime is 21153352921. The reversal of 21153352917 is 71925335112.

It is not a de Polignac number, because 21153352917 - 2⁴ = 21153352901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153352117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2319483 + ... + 2328584.

It is an arithmetic number, because the mean of its divisors is an integer number (1854579132).

Almost surely, 2^21153352917 is an apocalyptic number.

It is an amenable number.

21153352917 is a deficient number, since it is larger than the sum of its proper divisors (8519913195).

21153352917 is a wasteful number, since it uses less digits than its factorization.

21153352917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4648148.

The product of its digits is 56700, while the sum is 39.

The spelling of 21153352917 in words is "twenty-one billion, one hundred fifty-three million, three hundred fifty-two thousand, nine hundred seventeen".