121439122581 has 16 divisors (see below), whose sum is σ = 191019450368. Its totient is φ = 67155274800.

The previous prime is 121439122529. The next prime is 121439122589. The reversal of 121439122581 is 185221934121.

It is not a de Polignac number, because 121439122581 - 2³¹ = 119291638933 is a prime.

It is a super-2 number, since 2×121439122581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121439122589) 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 in 15 ways as a sum of consecutive naturals, for example, 93270565 + ... + 93271866.

It is an arithmetic number, because the mean of its divisors is an integer number (11938715648).

Almost surely, 2^121439122581 is an apocalyptic number.

It is an amenable number.

121439122581 is a deficient number, since it is larger than the sum of its proper divisors (69580327787).

121439122581 is a wasteful number, since it uses less digits than its factorization.

121439122581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186542472.

The product of its digits is 34560, while the sum is 39.

The spelling of 121439122581 in words is "one hundred twenty-one billion, four hundred thirty-nine million, one hundred twenty-two thousand, five hundred eighty-one".