21475028100 has 36 divisors (see below), whose sum is σ = 62134415504. Its totient is φ = 5726674080.

The previous prime is 21475028089. The next prime is 21475028117. The reversal of 21475028100 is 182057412.

It is a super-2 number, since 2×21475028100² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35791414 + ... + 35792013.

Almost surely, 2^21475028100 is an apocalyptic number.

21475028100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21475028100 is an abundant number, since it is smaller than the sum of its proper divisors (40659387404).

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

21475028100 is a wasteful number, since it uses less digits than its factorization.

21475028100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71583444 (or 71583437 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The spelling of 21475028100 in words is "twenty-one billion, four hundred seventy-five million, twenty-eight thousand, one hundred".