21016107097 has 2 divisors, whose sum is σ = 21016107098. Its totient is φ = 21016107096.

The previous prime is 21016107061. The next prime is 21016107113. The reversal of 21016107097 is 79070161012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17798494921 + 3217612176 = 133411^2 + 56724^2 .

It is a cyclic number.

It is not a de Polignac number, because 21016107097 - 2¹¹ = 21016105049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21016107797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10508053548 + 10508053549.

It is an arithmetic number, because the mean of its divisors is an integer number (10508053549).

Almost surely, 2^21016107097 is an apocalyptic number.

It is an amenable number.

21016107097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21016107097 is an equidigital number, since it uses as much as digits as its factorization.

21016107097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 34.

The spelling of 21016107097 in words is "twenty-one billion, sixteen million, one hundred seven thousand, ninety-seven".