97621013521 has 4 divisors (see below), whose sum is σ = 97663700992. Its totient is φ = 97578326052.

The previous prime is 97621013519. The next prime is 97621013557. The reversal of 97621013521 is 12531012679.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 97621013521 - 2¹ = 97621013519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97621013921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21340305 + ... + 21344878.

It is an arithmetic number, because the mean of its divisors is an integer number (24415925248).

Almost surely, 2^97621013521 is an apocalyptic number.

It is an amenable number.

97621013521 is a deficient number, since it is larger than the sum of its proper divisors (42687471).

97621013521 is a wasteful number, since it uses less digits than its factorization.

97621013521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42687470.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 97621013521 in words is "ninety-seven billion, six hundred twenty-one million, thirteen thousand, five hundred twenty-one".