15140021240 has 32 divisors (see below), whose sum is σ = 34136208000. Its totient is φ = 6043357824.

The previous prime is 15140021203. The next prime is 15140021249. The reversal of 15140021240 is 4212004151.

It is a happy number.

It is a super-2 number, since 2×15140021240² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15140021249) 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, 375935 + ... + 414254.

It is an arithmetic number, because the mean of its divisors is an integer number (1066756500).

Almost surely, 2^15140021240 is an apocalyptic number.

15140021240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15140021240 is an abundant number, since it is smaller than the sum of its proper divisors (18996186760).

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

15140021240 is a wasteful number, since it uses less digits than its factorization.

15140021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790679 (or 790675 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 15140021240 its reverse (4212004151), we get a palindrome (19352025391).

The spelling of 15140021240 in words is "fifteen billion, one hundred forty million, twenty-one thousand, two hundred forty".