21242110100 has 36 divisors (see below), whose sum is σ = 46156920768. Its totient is φ = 8485500000.

The previous prime is 21242110091. The next prime is 21242110117. The reversal of 21242110100 is 101124212.

It is a happy number.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 66326 + ... + 216525.

It is an arithmetic number, because the mean of its divisors is an integer number (1282136688).

Almost surely, 2^21242110100 is an apocalyptic number.

21242110100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21242110100 is an abundant number, since it is smaller than the sum of its proper divisors (24914810668).

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

21242110100 is a wasteful number, since it uses less digits than its factorization.

21242110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283616 (or 283609 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21242110100 its reverse (101124212), we get a palindrome (21343234312).

The spelling of 21242110100 in words is "twenty-one billion, two hundred forty-two million, one hundred ten thousand, one hundred".