97210515721 has 16 divisors (see below), whose sum is σ = 109765886400. Its totient is φ = 85278222400.

The previous prime is 97210515719. The next prime is 97210515827. The reversal of 97210515721 is 12751501279.

It is a cyclic number.

It is not a de Polignac number, because 97210515721 - 2¹ = 97210515719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97210516721) 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, 493575 + ... + 661843.

It is an arithmetic number, because the mean of its divisors is an integer number (6860367900).

Almost surely, 2^97210515721 is an apocalyptic number.

It is an amenable number.

97210515721 is a deficient number, since it is larger than the sum of its proper divisors (12555370679).

97210515721 is a wasteful number, since it uses less digits than its factorization.

97210515721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170120.

The product of its (nonzero) digits is 44100, while the sum is 40.

The spelling of 97210515721 in words is "ninety-seven billion, two hundred ten million, five hundred fifteen thousand, seven hundred twenty-one".