21307475100 has 72 divisors (see below), whose sum is σ = 62260108848. Its totient is φ = 5625728000.

The previous prime is 21307475099. The next prime is 21307475153. The reversal of 21307475100 is 157470312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 321309 + ... + 381908.

It is an arithmetic number, because the mean of its divisors is an integer number (864723734).

Almost surely, 2^21307475100 is an apocalyptic number.

21307475100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21307475100 is an abundant number, since it is smaller than the sum of its proper divisors (40952633748).

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

21307475100 is a wasteful number, since it uses less digits than its factorization.

21307475100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703335 (or 703328 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The spelling of 21307475100 in words is "twenty-one billion, three hundred seven million, four hundred seventy-five thousand, one hundred".