121561025040 has 240 divisors, whose sum is σ = 502452507648. Its totient is φ = 25648026624.

The previous prime is 121561025021. The next prime is 121561025093. The reversal of 121561025040 is 40520165121.

121561025040 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 610 + 2 + 5 + 0 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a junction number, because it is equal to n+sod(n) for n = 121561024995 and 121561025013.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 862144 + ... + 993183.

Almost surely, 2^121561025040 is an apocalyptic number.

121561025040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121561025040 is an abundant number, since it is smaller than the sum of its proper divisors (380891482608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121561025040 is a wasteful number, since it uses less digits than its factorization.

121561025040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855366 (or 1855357 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 121561025040 in words is "one hundred twenty-one billion, five hundred sixty-one million, twenty-five thousand, forty".