21090920300 has 18 divisors (see below), whose sum is σ = 45767297268. Its totient is φ = 8436368080.

The previous prime is 21090920281. The next prime is 21090920309. The reversal of 21090920300 is 302909012.

It is a self number, because there is not a number n which added to its sum of digits gives 21090920300.

It is not an unprimeable number, because it can be changed into a prime (21090920309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105454502 + ... + 105454701.

It is an arithmetic number, because the mean of its divisors is an integer number (2542627626).

Almost surely, 2^21090920300 is an apocalyptic number.

21090920300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21090920300 is an abundant number, since it is smaller than the sum of its proper divisors (24676376968).

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

21090920300 is a wasteful number, since it uses less digits than its factorization.

21090920300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210909217 (or 210909210 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 21090920300 in words is "twenty-one billion, ninety million, nine hundred twenty thousand, three hundred".