21213303100 has 72 divisors (see below), whose sum is σ = 51837682176. Its totient is φ = 7465080000.

The previous prime is 21213303091. The next prime is 21213303113. The reversal of 21213303100 is 130331212.

It is a super-2 number, since 2×21213303100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 276946 + ... + 345145.

It is an arithmetic number, because the mean of its divisors is an integer number (719967808).

Almost surely, 2^21213303100 is an apocalyptic number.

21213303100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213303100 is an abundant number, since it is smaller than the sum of its proper divisors (30624379076).

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

21213303100 is a wasteful number, since it uses less digits than its factorization.

21213303100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622147 (or 622140 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21213303100 its reverse (130331212), we get a palindrome (21343634312).

The spelling of 21213303100 in words is "twenty-one billion, two hundred thirteen million, three hundred three thousand, one hundred".