21122012100257 has 2 divisors, whose sum is σ = 21122012100258. Its totient is φ = 21122012100256.

The previous prime is 21122012100197. The next prime is 21122012100281. The reversal of 21122012100257 is 75200121022112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20700643641616 + 421368458641 = 4549796^2 + 649129^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122012100257 - 2⁶ = 21122012100193 is a prime.

It is a super-2 number, since 2×21122012100257² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122012100557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561006050128 + 10561006050129.

It is an arithmetic number, because the mean of its divisors is an integer number (10561006050129).

Almost surely, 2^{21122012100257} is an apocalyptic number.

It is an amenable number.

21122012100257 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122012100257 is an equidigital number, since it uses as much as digits as its factorization.

21122012100257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

Adding to 21122012100257 its reverse (75200121022112), we get a palindrome (96322133122369).

The spelling of 21122012100257 in words is "twenty-one trillion, one hundred twenty-two billion, twelve million, one hundred thousand, two hundred fifty-seven".