11969121920 has 64 divisors (see below), whose sum is σ = 32701363200. Its totient is φ = 4103697408.

The previous prime is 11969121887. The next prime is 11969121973. The reversal of 11969121920 is 2912196911.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

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, 1331360 + ... + 1340319.

It is an arithmetic number, because the mean of its divisors is an integer number (510958800).

Almost surely, 2^11969121920 is an apocalyptic number.

11969121920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11969121920 is an abundant number, since it is smaller than the sum of its proper divisors (20732241280).

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

11969121920 is an equidigital number, since it uses as much as digits as its factorization.

11969121920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671705 (or 2671693 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 41.

The spelling of 11969121920 in words is "eleven billion, nine hundred sixty-nine million, one hundred twenty-one thousand, nine hundred twenty".