11942721840 has 80 divisors (see below), whose sum is σ = 42311363328. Its totient is φ = 2729764608.

The previous prime is 11942721811. The next prime is 11942721851. The reversal of 11942721840 is 4812724911.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×11942721840² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3552702 + ... + 3556061.

Almost surely, 2^11942721840 is an apocalyptic number.

11942721840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11942721840 is an abundant number, since it is smaller than the sum of its proper divisors (30368641488).

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

11942721840 is a wasteful number, since it uses less digits than its factorization.

11942721840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7108786 (or 7108780 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 11942721840 in words is "eleven billion, nine hundred forty-two million, seven hundred twenty-one thousand, eight hundred forty".