97000021 has 2 divisors, whose sum is σ = 97000022. Its totient is φ = 97000020.

The previous prime is 97000019. The next prime is 97000037. The reversal of 97000021 is 12000079.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73719396 + 23280625 = 8586^2 + 4825^2 .

It is a cyclic number.

It is not a de Polignac number, because 97000021 - 2¹ = 97000019 is a prime.

Together with 97000019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97000061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48500010 + 48500011.

It is an arithmetic number, because the mean of its divisors is an integer number (48500011).

Almost surely, 2^97000021 is an apocalyptic number.

It is an amenable number.

97000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

97000021 is an equidigital number, since it uses as much as digits as its factorization.

97000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 97000021 is about 9848.8588679095. The cubic root of 97000021 is about 459.4701223783.

The spelling of 97000021 in words is "ninety-seven million, twenty-one", and thus it is an aban number and an uban number.