21211013100 has 36 divisors (see below), whose sum is σ = 61370532104. Its totient is φ = 5656270080.

The previous prime is 21211013093. The next prime is 21211013111. The reversal of 21211013100 is 131011212.

It is a super-2 number, since 2×21211013100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35351389 + ... + 35351988.

Almost surely, 2^21211013100 is an apocalyptic number.

21211013100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211013100 is an abundant number, since it is smaller than the sum of its proper divisors (40159519004).

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

21211013100 is a wasteful number, since it uses less digits than its factorization.

21211013100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70703394 (or 70703387 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21211013100 its reverse (131011212), we get a palindrome (21342024312).

The spelling of 21211013100 in words is "twenty-one billion, two hundred eleven million, thirteen thousand, one hundred".