11215511010 has 48 divisors (see below), whose sum is σ = 31811270400. Its totient is φ = 2718911520.

The previous prime is 11215510993. The next prime is 11215511017. The reversal of 11215511010 is 1011551211.

11215511010 is a `hidden beast` number, since 1 + 12 + 1 + 551 + 101 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (11215511017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5663410 + ... + 5665389.

It is an arithmetic number, because the mean of its divisors is an integer number (662734800).

Almost surely, 2^11215511010 is an apocalyptic number.

11215511010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11215511010 is an abundant number, since it is smaller than the sum of its proper divisors (20595759390).

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

11215511010 is a wasteful number, since it uses less digits than its factorization.

11215511010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11328823 (or 11328820 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 18.

It can be divided in two parts, 11215 and 511010, that added together give a palindrome (522225).

The spelling of 11215511010 in words is "eleven billion, two hundred fifteen million, five hundred eleven thousand, ten".