21901199020 has 24 divisors (see below), whose sum is σ = 46005420384. Its totient is φ = 8758022016.

The previous prime is 21901198999. The next prime is 21901199027. The reversal of 21901199020 is 2099110912.

It is not an unprimeable number, because it can be changed into a prime (21901199027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79657 + ... + 223936.

It is an arithmetic number, because the mean of its divisors is an integer number (1916892516).

Almost surely, 2^21901199020 is an apocalyptic number.

21901199020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21901199020 is an abundant number, since it is smaller than the sum of its proper divisors (24104221364).

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

21901199020 is a wasteful number, since it uses less digits than its factorization.

21901199020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307209 (or 307207 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 21901199020 in words is "twenty-one billion, nine hundred one million, one hundred ninety-nine thousand, twenty".