21500115160140 has 72 divisors (see below), whose sum is σ = 67320790712448. Its totient is φ = 5548416814080.

The previous prime is 21500115160087. The next prime is 21500115160207. The reversal of 21500115160140 is 4106151100512.

21500115160140 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 0 + 1 + 1 + 51 + 601 + 4 + 0 = 666.

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, 1926528037 + ... + 1926539196.

Almost surely, 2^{21500115160140} is an apocalyptic number.

21500115160140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21500115160140 is an abundant number, since it is smaller than the sum of its proper divisors (45820675552308).

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

21500115160140 is a wasteful number, since it uses less digits than its factorization.

21500115160140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3853067279 (or 3853067274 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

Adding to 21500115160140 its reverse (4106151100512), we get a palindrome (25606266260652).

The spelling of 21500115160140 in words is "twenty-one trillion, five hundred billion, one hundred fifteen million, one hundred sixty thousand, one hundred forty".