21203313100 has 18 divisors (see below), whose sum is σ = 46011189644. Its totient is φ = 8481325200.

The previous prime is 21203313059. The next prime is 21203313113. The reversal of 21203313100 is 131330212.

It is a super-2 number, since 2×21203313100² (a number of 21 digits) contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 106016466 + ... + 106016665.

Almost surely, 2^21203313100 is an apocalyptic number.

21203313100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203313100 is an abundant number, since it is smaller than the sum of its proper divisors (24807876544).

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

21203313100 is a wasteful number, since it uses less digits than its factorization.

21203313100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212033145 (or 212033138 counting only the distinct ones).

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

Adding to 21203313100 its reverse (131330212), we get a palindrome (21334643312).

The spelling of 21203313100 in words is "twenty-one billion, two hundred three million, three hundred thirteen thousand, one hundred".