121561025015 has 32 divisors (see below), whose sum is σ = 154121510400. Its totient is φ = 91788681600.

The previous prime is 121561024973. The next prime is 121561025021. The reversal of 121561025015 is 510520165121.

It is a de Polignac number, because none of the positive numbers 2^k-121561025015 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36823865 + ... + 36827165.

It is an arithmetic number, because the mean of its divisors is an integer number (4816297200).

Almost surely, 2^121561025015 is an apocalyptic number.

121561025015 is a deficient number, since it is larger than the sum of its proper divisors (32560485385).

121561025015 is a wasteful number, since it uses less digits than its factorization.

121561025015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647.

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 121561025015 in words is "one hundred twenty-one billion, five hundred sixty-one million, twenty-five thousand, fifteen".