215123635500 has 192 divisors, whose sum is σ = 670749206400. Its totient is φ = 53384601600.

The previous prime is 215123635477. The next prime is 215123635501. The reversal of 215123635500 is 5536321512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (215123635501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2222106 + ... + 2316894.

It is an arithmetic number, because the mean of its divisors is an integer number (3493485450).

Almost surely, 2^215123635500 is an apocalyptic number.

215123635500 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 215123635500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335374603200).

215123635500 is an abundant number, since it is smaller than the sum of its proper divisors (455625570900).

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

215123635500 is a wasteful number, since it uses less digits than its factorization.

215123635500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94917 (or 94905 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

The spelling of 215123635500 in words is "two hundred fifteen billion, one hundred twenty-three million, six hundred thirty-five thousand, five hundred".