21232121597 has 2 divisors, whose sum is σ = 21232121598. Its totient is φ = 21232121596.

The previous prime is 21232121569. The next prime is 21232121623. The reversal of 21232121597 is 79512123212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19252672516 + 1979449081 = 138754^2 + 44491^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232121597 - 2⁸ = 21232121341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232141597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616060798 + 10616060799.

It is an arithmetic number, because the mean of its divisors is an integer number (10616060799).

Almost surely, 2^21232121597 is an apocalyptic number.

It is an amenable number.

21232121597 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232121597 is an equidigital number, since it uses as much as digits as its factorization.

21232121597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The spelling of 21232121597 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-one thousand, five hundred ninety-seven".