21515010113140 has 48 divisors (see below), whose sum is σ = 46218105222912. Its totient is φ = 8409156898176.

The previous prime is 21515010113117. The next prime is 21515010113147. The reversal of 21515010113140 is 4131101051512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515010113147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18092874 + ... + 19245313.

It is an arithmetic number, because the mean of its divisors is an integer number (962877192144).

Almost surely, 2^{21515010113140} is an apocalyptic number.

21515010113140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21515010113140 is an abundant number, since it is smaller than the sum of its proper divisors (24703095109772).

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

21515010113140 is a wasteful number, since it uses less digits than its factorization.

21515010113140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37338856 (or 37338854 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 25.

Adding to 21515010113140 its reverse (4131101051512), we get a palindrome (25646111164652).

The spelling of 21515010113140 in words is "twenty-one trillion, five hundred fifteen billion, ten million, one hundred thirteen thousand, one hundred forty".