11912209920 has 560 divisors, whose sum is σ = 46210448592. Its totient is φ = 2926264320.

The previous prime is 11912209919. The next prime is 11912209921. The reversal of 11912209920 is 2990221911.

It is an interprime number because it is at equal distance from previous prime (11912209919) and next prime (11912209921).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11912209921) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 24260875 + ... + 24261365.

Almost surely, 2^11912209920 is an apocalyptic number.

11912209920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11912209920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23105224296).

11912209920 is an abundant number, since it is smaller than the sum of its proper divisors (34298238672).

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

11912209920 is an frugal number, since it uses more digits than its factorization.

11912209920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 11912209920 in words is "eleven billion, nine hundred twelve million, two hundred nine thousand, nine hundred twenty".