21640111419920 has 80 divisors (see below), whose sum is σ = 59355734227968. Its totient is φ = 7180129128960.

The previous prime is 21640111419853. The next prime is 21640111419929. The reversal of 21640111419920 is 2991411104612.

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

It is not an unprimeable number, because it can be changed into a prime (21640111419929) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 623257739 + ... + 623292458.

Almost surely, 2^{21640111419920} is an apocalyptic number.

21640111419920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21640111419920 is an abundant number, since it is smaller than the sum of its proper divisors (37715622808048).

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

21640111419920 is a wasteful number, since it uses less digits than its factorization.

21640111419920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246550248 (or 1246550242 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The spelling of 21640111419920 in words is "twenty-one trillion, six hundred forty billion, one hundred eleven million, four hundred nineteen thousand, nine hundred twenty".