11213661520 has 40 divisors (see below), whose sum is σ = 26149190184. Its totient is φ = 4472143872.

The previous prime is 11213661497. The next prime is 11213661539. The reversal of 11213661520 is 2516631211.

It can be written as a sum of positive squares in 4 ways, for example, as 942244416 + 10271417104 = 30696^2 + 101348^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 181009 + ... + 234928.

Almost surely, 2^11213661520 is an apocalyptic number.

11213661520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11213661520 is an abundant number, since it is smaller than the sum of its proper divisors (14935528664).

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

11213661520 is a wasteful number, since it uses less digits than its factorization.

11213661520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416287 (or 416281 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 11213661520 in words is "eleven billion, two hundred thirteen million, six hundred sixty-one thousand, five hundred twenty".