215657020000 has 120 divisors (see below), whose sum is σ = 531653372712. Its totient is φ = 86083200000.

The previous prime is 215657019973. The next prime is 215657020049. The reversal of 215657020000 is 20756512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9809020 + ... + 9830980.

Almost surely, 2^215657020000 is an apocalyptic number.

215657020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215657020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265826686356).

215657020000 is an abundant number, since it is smaller than the sum of its proper divisors (315996352712).

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

215657020000 is an equidigital number, since it uses as much as digits as its factorization.

215657020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22482 (or 22459 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

Adding to 215657020000 its reverse (20756512), we get a palindrome (215677776512).

The spelling of 215657020000 in words is "two hundred fifteen billion, six hundred fifty-seven million, twenty thousand".