21750040100 has 18 divisors (see below), whose sum is σ = 47197587234. Its totient is φ = 8700016000.

The previous prime is 21750040099. The next prime is 21750040133. The reversal of 21750040100 is 104005712.

It can be written as a sum of positive squares in 3 ways, for example, as 6278660644 + 15471379456 = 79238^2 + 124384^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108750101 + ... + 108750300.

Almost surely, 2^21750040100 is an apocalyptic number.

21750040100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21750040100 is an abundant number, since it is smaller than the sum of its proper divisors (25447547134).

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

21750040100 is a wasteful number, since it uses less digits than its factorization.

21750040100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217500415 (or 217500408 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

Adding to 21750040100 its reverse (104005712), we get a palindrome (21854045812).

The spelling of 21750040100 in words is "twenty-one billion, seven hundred fifty million, forty thousand, one hundred".