21103313100 has 36 divisors (see below), whose sum is σ = 61058920104. Its totient is φ = 5627550080.

The previous prime is 21103313087. The next prime is 21103313111. The reversal of 21103313100 is 131330112.

It is a super-2 number, since 2×21103313100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21103313100.

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, 35171889 + ... + 35172488.

It is an arithmetic number, because the mean of its divisors is an integer number (1696081114).

Almost surely, 2^21103313100 is an apocalyptic number.

21103313100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103313100 is an abundant number, since it is smaller than the sum of its proper divisors (39955607004).

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

21103313100 is a wasteful number, since it uses less digits than its factorization.

21103313100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70344394 (or 70344387 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 21103313100 its reverse (131330112), we get a palindrome (21234643212).

The spelling of 21103313100 in words is "twenty-one billion, one hundred three million, three hundred thirteen thousand, one hundred".