21160621517 has 8 divisors (see below), whose sum is σ = 24237432000. Its totient is φ = 18097277184.

The previous prime is 21160621507. The next prime is 21160621541. The reversal of 21160621517 is 71512606112.

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

It is not a de Polignac number, because 21160621517 - 2⁶ = 21160621453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160621507) 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, 3363167 + ... + 3369452.

It is an arithmetic number, because the mean of its divisors is an integer number (3029679000).

Almost surely, 2^21160621517 is an apocalyptic number.

It is an amenable number.

21160621517 is a deficient number, since it is larger than the sum of its proper divisors (3076810483).

21160621517 is an equidigital number, since it uses as much as digits as its factorization.

21160621517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733075.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 21160621517 in words is "twenty-one billion, one hundred sixty million, six hundred twenty-one thousand, five hundred seventeen".