22021212109957 has 2 divisors, whose sum is σ = 22021212109958. Its totient is φ = 22021212109956.

The previous prime is 22021212109943. The next prime is 22021212110003. The reversal of 22021212109957 is 75990121212022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22007366822401 + 13845287556 = 4691201^2 + 117666^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021212109957 - 2⁷ = 22021212109829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22021212100957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010606054978 + 11010606054979.

It is an arithmetic number, because the mean of its divisors is an integer number (11010606054979).

Almost surely, 2^{22021212109957} is an apocalyptic number.

It is an amenable number.

22021212109957 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021212109957 is an equidigital number, since it uses as much as digits as its factorization.

22021212109957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 22021212109957 in words is "twenty-two trillion, twenty-one billion, two hundred twelve million, one hundred nine thousand, nine hundred fifty-seven".