1221942525137 has 2 divisors, whose sum is σ = 1221942525138. Its totient is φ = 1221942525136.

The previous prime is 1221942525131. The next prime is 1221942525149. The reversal of 1221942525137 is 7315252491221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 740418946576 + 481523578561 = 860476^2 + 693919^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221942525137 - 2⁴ = 1221942525121 is a prime.

It is a super-3 number, since 3×1221942525137³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1221942525131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610971262568 + 610971262569.

It is an arithmetic number, because the mean of its divisors is an integer number (610971262569).

Almost surely, 2^{1221942525137} is an apocalyptic number.

It is an amenable number.

1221942525137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221942525137 is an equidigital number, since it uses as much as digits as its factorization.

1221942525137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 44.

The spelling of 1221942525137 in words is "one trillion, two hundred twenty-one billion, nine hundred forty-two million, five hundred twenty-five thousand, one hundred thirty-seven".