215564011100 has 36 divisors (see below), whose sum is σ = 474755618904. Its totient is φ = 84938652480.

The previous prime is 215564011079. The next prime is 215564011171. The reversal of 215564011100 is 1110465512.

It is a self number, because there is not a number n which added to its sum of digits gives 215564011100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16080167 + ... + 16093566.

Almost surely, 2^215564011100 is an apocalyptic number.

215564011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215564011100 is an abundant number, since it is smaller than the sum of its proper divisors (259191607804).

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

215564011100 is a wasteful number, since it uses less digits than its factorization.

215564011100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32173814 (or 32173807 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 215564011100 its reverse (1110465512), we get a palindrome (216674476612).

The spelling of 215564011100 in words is "two hundred fifteen billion, five hundred sixty-four million, eleven thousand, one hundred".