1210021121957 has 2 divisors, whose sum is σ = 1210021121958. Its totient is φ = 1210021121956.

The previous prime is 1210021121941. The next prime is 1210021122017. The reversal of 1210021121957 is 7591211200121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 889567762561 + 320453359396 = 943169^2 + 566086^2 .

It is an emirp because it is prime and its reverse (7591211200121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1210021121957 - 2⁴ = 1210021121941 is a prime.

It is a super-2 number, since 2×1210021121957² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210021123957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605010560978 + 605010560979.

It is an arithmetic number, because the mean of its divisors is an integer number (605010560979).

Almost surely, 2^{1210021121957} is an apocalyptic number.

It is an amenable number.

1210021121957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210021121957 is an equidigital number, since it uses as much as digits as its factorization.

1210021121957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 32.

The spelling of 1210021121957 in words is "one trillion, two hundred ten billion, twenty-one million, one hundred twenty-one thousand, nine hundred fifty-seven".