21090229900 has 36 divisors (see below), whose sum is σ = 48174529480. Its totient is φ = 7992086400.

The previous prime is 21090229889. The next prime is 21090229921. The reversal of 21090229900 is 992209012.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 5548161 + ... + 5551960.

Almost surely, 2^21090229900 is an apocalyptic number.

21090229900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21090229900 is an abundant number, since it is smaller than the sum of its proper divisors (27084299580).

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

21090229900 is a wasteful number, since it uses less digits than its factorization.

21090229900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11100154 (or 11100147 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 21090229900 in words is "twenty-one billion, ninety million, two hundred twenty-nine thousand, nine hundred".