21210103100 has 18 divisors (see below), whose sum is σ = 46025923944. Its totient is φ = 8484041200.

The previous prime is 21210103087. The next prime is 21210103133. The reversal of 21210103100 is 130101212.

It is a super-2 number, since 2×21210103100² (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 5 ways as a sum of consecutive naturals, for example, 106050416 + ... + 106050615.

Almost surely, 2^21210103100 is an apocalyptic number.

21210103100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210103100 is an abundant number, since it is smaller than the sum of its proper divisors (24815820844).

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

21210103100 is a wasteful number, since it uses less digits than its factorization.

21210103100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212101045 (or 212101038 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21210103100 its reverse (130101212), we get a palindrome (21340204312).

The spelling of 21210103100 in words is "twenty-one billion, two hundred ten million, one hundred three thousand, one hundred".