121930255447 has 32 divisors (see below), whose sum is σ = 163984665600. Its totient is φ = 87555237120.

The previous prime is 121930255423. The next prime is 121930255463. The reversal of 121930255447 is 744552039121.

It is a de Polignac number, because none of the positive numbers 2^k-121930255447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121930253447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497923 + ... + 701275.

It is an arithmetic number, because the mean of its divisors is an integer number (5124520800).

Almost surely, 2^121930255447 is an apocalyptic number.

121930255447 is a deficient number, since it is larger than the sum of its proper divisors (42054410153).

121930255447 is a wasteful number, since it uses less digits than its factorization.

121930255447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203983.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 121930255447 in words is "one hundred twenty-one billion, nine hundred thirty million, two hundred fifty-five thousand, four hundred forty-seven".