15121010540 has 24 divisors (see below), whose sum is σ = 33425392560. Its totient is φ = 5730067008.

The previous prime is 15121010537. The next prime is 15121010549. The reversal of 15121010540 is 4501012151.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (15121010549) 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, 19895687 + ... + 19896446.

It is an arithmetic number, because the mean of its divisors is an integer number (1392724690).

Almost surely, 2^15121010540 is an apocalyptic number.

15121010540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15121010540 is an abundant number, since it is smaller than the sum of its proper divisors (18304382020).

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

15121010540 is a wasteful number, since it uses less digits than its factorization.

15121010540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39792161 (or 39792159 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

Adding to 15121010540 its reverse (4501012151), we get a palindrome (19622022691).

The spelling of 15121010540 in words is "fifteen billion, one hundred twenty-one million, ten thousand, five hundred forty".