21436089900 has 72 divisors (see below), whose sum is σ = 62062694400. Its totient is φ = 5712517440.

The previous prime is 21436089887. The next prime is 21436089911. The reversal of 21436089900 is 998063412.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 447301 + ... + 492899.

Almost surely, 2^21436089900 is an apocalyptic number.

21436089900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21436089900 is an abundant number, since it is smaller than the sum of its proper divisors (40626604500).

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

21436089900 is a wasteful number, since it uses less digits than its factorization.

21436089900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47183 (or 47176 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 21436089900 in words is "twenty-one billion, four hundred thirty-six million, eighty-nine thousand, nine hundred".