21131440100 has 36 divisors (see below), whose sum is σ = 45917102784. Its totient is φ = 8441170080.

The previous prime is 21131440097. The next prime is 21131440117. The reversal of 21131440100 is 104413112.

It is a happy number.

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, 67904 + ... + 216503.

Almost surely, 2^21131440100 is an apocalyptic number.

21131440100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131440100 is an abundant number, since it is smaller than the sum of its proper divisors (24785662684).

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

21131440100 is a wasteful number, since it uses less digits than its factorization.

21131440100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285164 (or 285157 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21131440100 its reverse (104413112), we get a palindrome (21235853212).

The spelling of 21131440100 in words is "twenty-one billion, one hundred thirty-one million, four hundred forty thousand, one hundred".