11891208920 has 32 divisors (see below), whose sum is σ = 26759391120. Its totient is φ = 4755742080.

The previous prime is 11891208907. The next prime is 11891208971. The reversal of 11891208920 is 2980219811.

It is a happy number.

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, 288314 + ... + 326966.

Almost surely, 2^11891208920 is an apocalyptic number.

11891208920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11891208920 is an abundant number, since it is smaller than the sum of its proper divisors (14868182200).

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

11891208920 is a wasteful number, since it uses less digits than its factorization.

11891208920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46355 (or 46351 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 41.

The spelling of 11891208920 in words is "eleven billion, eight hundred ninety-one million, two hundred eight thousand, nine hundred twenty".