2011921345920 has 64 divisors (see below), whose sum is σ = 6412999296240. Its totient is φ = 536512358400.

The previous prime is 2011921345919. The next prime is 2011921345933. The reversal of 2011921345920 is 295431291102.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523935931 + ... + 523939770.

Almost surely, 2^{2011921345920} is an apocalyptic number.

2011921345920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011921345920 is an abundant number, since it is smaller than the sum of its proper divisors (4401077950320).

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

2011921345920 is a wasteful number, since it uses less digits than its factorization.

2011921345920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047875723 (or 1047875711 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 2011921345920 in words is "two trillion, eleven billion, nine hundred twenty-one million, three hundred forty-five thousand, nine hundred twenty".