21022100948957 has 2 divisors, whose sum is σ = 21022100948958. Its totient is φ = 21022100948956.

The previous prime is 21022100948941. The next prime is 21022100948993. The reversal of 21022100948957 is 75984900122012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14111059347961 + 6911041600996 = 3756469^2 + 2628886^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022100948957 - 2⁴ = 21022100948941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022100948917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511050474478 + 10511050474479.

It is an arithmetic number, because the mean of its divisors is an integer number (10511050474479).

Almost surely, 2^{21022100948957} is an apocalyptic number.

It is an amenable number.

21022100948957 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022100948957 is an equidigital number, since it uses as much as digits as its factorization.

21022100948957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 21022100948957 in words is "twenty-one trillion, twenty-two billion, one hundred million, nine hundred forty-eight thousand, nine hundred fifty-seven".