121015590 has 16 divisors (see below), whose sum is σ = 290437488. Its totient is φ = 32270816.

The previous prime is 121015561. The next prime is 121015591. The reversal of 121015590 is 95510121.

It is a self number, because there is not a number n which added to its sum of digits gives 121015590.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121015591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2016897 + ... + 2016956.

It is an arithmetic number, because the mean of its divisors is an integer number (18152343).

Almost surely, 2^121015590 is an apocalyptic number.

121015590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121015590 is an abundant number, since it is smaller than the sum of its proper divisors (169421898).

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

121015590 is a wasteful number, since it uses less digits than its factorization.

121015590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4033863.

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 121015590 is about 11000.7086135394. The cubic root of 121015590 is about 494.6299857000.

The spelling of 121015590 in words is "one hundred twenty-one million, fifteen thousand, five hundred ninety".