21010000312 has 64 divisors (see below), whose sum is σ = 46150372800. Its totient is φ = 8778792960.

The previous prime is 21010000261. The next prime is 21010000327. The reversal of 21010000312 is 21300001012.

It is a super-2 number, since 2×21010000312² (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 15 ways as a sum of consecutive naturals, for example, 5951764 + ... + 5955292.

It is an arithmetic number, because the mean of its divisors is an integer number (721099575).

Almost surely, 2^21010000312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010000312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23075186400).

21010000312 is an abundant number, since it is smaller than the sum of its proper divisors (25140372488).

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

21010000312 is a wasteful number, since it uses less digits than its factorization.

21010000312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6176 (or 6172 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21010000312 its reverse (21300001012), we get a palindrome (42310001324).

The spelling of 21010000312 in words is "twenty-one billion, ten million, three hundred twelve", and thus it is an aban number.