11212521220 has 24 divisors (see below), whose sum is σ = 23569953624. Its totient is φ = 4480502016.

The previous prime is 11212521217. The next prime is 11212521239. The reversal of 11212521220 is 2212521211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6275491524 + 4937029696 = 79218^2 + 70264^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261217 + ... + 301096.

It is an arithmetic number, because the mean of its divisors is an integer number (982081401).

Almost surely, 2^11212521220 is an apocalyptic number.

11212521220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11212521220 is an abundant number, since it is smaller than the sum of its proper divisors (12357432404).

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

11212521220 is a wasteful number, since it uses less digits than its factorization.

11212521220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563319 (or 563317 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Subtracting from 11212521220 its reverse (2212521211), we obtain a palindrome (9000000009).

The spelling of 11212521220 in words is "eleven billion, two hundred twelve million, five hundred twenty-one thousand, two hundred twenty".