121210221019957 has 2 divisors, whose sum is σ = 121210221019958. Its totient is φ = 121210221019956.

The previous prime is 121210221019933. The next prime is 121210221019973. The reversal of 121210221019957 is 759910122012121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70785821191761 + 50424399828196 = 8413431^2 + 7101014^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210221019957 - 2¹⁹ = 121210220495669 is a prime.

It is a super-2 number, since 2×121210221019957² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210221019357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605110509978 + 60605110509979.

It is an arithmetic number, because the mean of its divisors is an integer number (60605110509979).

Almost surely, 2^{121210221019957} is an apocalyptic number.

It is an amenable number.

121210221019957 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210221019957 is an equidigital number, since it uses as much as digits as its factorization.

121210221019957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 43.

The spelling of 121210221019957 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred twenty-one million, nineteen thousand, nine hundred fifty-seven".