21210100312 has 16 divisors (see below), whose sum is σ = 40155045840. Its totient is φ = 10502088096.

The previous prime is 21210100309. The next prime is 21210100319. The reversal of 21210100312 is 21300101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210100292 and 21210100301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210100319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12869383 + ... + 12871030.

It is an arithmetic number, because the mean of its divisors is an integer number (2509690365).

Almost surely, 2^21210100312 is an apocalyptic number.

It is an amenable number.

21210100312 is a deficient number, since it is larger than the sum of its proper divisors (18944945528).

21210100312 is a wasteful number, since it uses less digits than its factorization.

21210100312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25740522 (or 25740518 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21210100312 its reverse (21300101212), we get a palindrome (42510201524).

The spelling of 21210100312 in words is "twenty-one billion, two hundred ten million, one hundred thousand, three hundred twelve".