11215401813 has 24 divisors (see below), whose sum is σ = 20197434816. Its totient is φ = 5826182400.

The previous prime is 11215401787. The next prime is 11215401829. The reversal of 11215401813 is 31810451211.

11215401813 is a `hidden beast` number, since 112 + 1 + 540 + 1 + 8 + 1 + 3 = 666.

It is not a de Polignac number, because 11215401813 - 2⁵ = 11215401781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11215401413) 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, 8091228 + ... + 8092613.

It is an arithmetic number, because the mean of its divisors is an integer number (841559784).

Almost surely, 2^11215401813 is an apocalyptic number.

It is an amenable number.

11215401813 is a deficient number, since it is larger than the sum of its proper divisors (8982033003).

11215401813 is a wasteful number, since it uses less digits than its factorization.

11215401813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16183865 (or 16183862 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The spelling of 11215401813 in words is "eleven billion, two hundred fifteen million, four hundred one thousand, eight hundred thirteen".