21031100312 has 8 divisors (see below), whose sum is σ = 39433313100. Its totient is φ = 10515550152.

The previous prime is 21031100227. The next prime is 21031100327. The reversal of 21031100312 is 21300113012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1314443762 + ... + 1314443777.

Almost surely, 2^21031100312 is an apocalyptic number.

It is an amenable number.

21031100312 is a deficient number, since it is larger than the sum of its proper divisors (18402212788).

21031100312 is a wasteful number, since it uses less digits than its factorization.

21031100312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628887545 (or 2628887541 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21031100312 its reverse (21300113012), we get a palindrome (42331213324).

The spelling of 21031100312 in words is "twenty-one billion, thirty-one million, one hundred thousand, three hundred twelve".