21330101957 has 2 divisors, whose sum is σ = 21330101958. Its totient is φ = 21330101956.

The previous prime is 21330101939. The next prime is 21330101971. The reversal of 21330101957 is 75910103312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12006461476 + 9323640481 = 109574^2 + 96559^2 .

It is a cyclic number.

It is not a de Polignac number, because 21330101957 - 2¹² = 21330097861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330101987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665050978 + 10665050979.

It is an arithmetic number, because the mean of its divisors is an integer number (10665050979).

Almost surely, 2^21330101957 is an apocalyptic number.

It is an amenable number.

21330101957 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330101957 is an equidigital number, since it uses as much as digits as its factorization.

21330101957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 32.

The spelling of 21330101957 in words is "twenty-one billion, three hundred thirty million, one hundred one thousand, nine hundred fifty-seven".