121565240406 has 48 divisors (see below), whose sum is σ = 270560440800. Its totient is φ = 39419218944.

The previous prime is 121565240351. The next prime is 121565240437. The reversal of 121565240406 is 604042565121.

121565240406 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 6 + 5 + 240 + 406 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4434550 + ... + 4461878.

It is an arithmetic number, because the mean of its divisors is an integer number (5636675850).

Almost surely, 2^121565240406 is an apocalyptic number.

121565240406 is an abundant number, since it is smaller than the sum of its proper divisors (148995200394).

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

121565240406 is a wasteful number, since it uses less digits than its factorization.

121565240406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34053 (or 34050 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 121565240406 in words is "one hundred twenty-one billion, five hundred sixty-five million, two hundred forty thousand, four hundred six".