21130342097 has 2 divisors, whose sum is σ = 21130342098. Its totient is φ = 21130342096.

The previous prime is 21130342091. The next prime is 21130342133. The reversal of 21130342097 is 79024303112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19242960961 + 1887381136 = 138719^2 + 43444^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130342097 - 2¹⁰ = 21130341073 is a prime.

It is not a weakly prime, because it can be changed into another prime (21130342091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565171048 + 10565171049.

It is an arithmetic number, because the mean of its divisors is an integer number (10565171049).

Almost surely, 2^21130342097 is an apocalyptic number.

It is an amenable number.

21130342097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130342097 is an equidigital number, since it uses as much as digits as its factorization.

21130342097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The spelling of 21130342097 in words is "twenty-one billion, one hundred thirty million, three hundred forty-two thousand, ninety-seven".