21515437531140 has 288 divisors, whose sum is σ = 75779895098880. Its totient is φ = 4530051219456.

The previous prime is 21515437531121. The next prime is 21515437531153. The reversal of 21515437531140 is 4113573451512.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 21515437531092 and 21515437531101.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2230525 + ... + 6928644.

It is an arithmetic number, because the mean of its divisors is an integer number (263124635760).

Almost surely, 2^{21515437531140} is an apocalyptic number.

21515437531140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21515437531140 is an abundant number, since it is smaller than the sum of its proper divisors (54264457567740).

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

21515437531140 is a wasteful number, since it uses less digits than its factorization.

21515437531140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9159259 (or 9159250 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 21515437531140 in words is "twenty-one trillion, five hundred fifteen billion, four hundred thirty-seven million, five hundred thirty-one thousand, one hundred forty".