121635004261531 has 2 divisors, whose sum is σ = 121635004261532. Its totient is φ = 121635004261530.

The previous prime is 121635004261489. The next prime is 121635004261579. The reversal of 121635004261531 is 135162400536121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121635004261531 - 2⁹ = 121635004261019 is a prime.

It is a super-2 number, since 2×121635004261531² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121635004261031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60817502130765 + 60817502130766.

It is an arithmetic number, because the mean of its divisors is an integer number (60817502130766).

Almost surely, 2^{121635004261531} is an apocalyptic number.

121635004261531 is a deficient number, since it is larger than the sum of its proper divisors (1).

121635004261531 is an equidigital number, since it uses as much as digits as its factorization.

121635004261531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 40.

Adding to 121635004261531 its reverse (135162400536121), we get a palindrome (256797404797652).

The spelling of 121635004261531 in words is "one hundred twenty-one trillion, six hundred thirty-five billion, four million, two hundred sixty-one thousand, five hundred thirty-one".