97807346921 has 2 divisors, whose sum is σ = 97807346922. Its totient is φ = 97807346920.

The previous prime is 97807346887. The next prime is 97807346963. The reversal of 97807346921 is 12964370879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87180829696 + 10626517225 = 295264^2 + 103085^2 .

It is a cyclic number.

It is not a de Polignac number, because 97807346921 - 2¹⁸ = 97807084777 is a prime.

It is a super-2 number, since 2×97807346921² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97807346971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48903673460 + 48903673461.

It is an arithmetic number, because the mean of its divisors is an integer number (48903673461).

Almost surely, 2^97807346921 is an apocalyptic number.

It is an amenable number.

97807346921 is a deficient number, since it is larger than the sum of its proper divisors (1).

97807346921 is an equidigital number, since it uses as much as digits as its factorization.

97807346921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 97807346921 in words is "ninety-seven billion, eight hundred seven million, three hundred forty-six thousand, nine hundred twenty-one".