10001721312 has 72 divisors (see below), whose sum is σ = 31028077080. Its totient is φ = 3030823680.

The previous prime is 10001721287. The next prime is 10001721329. The reversal of 10001721312 is 21312710001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1575387 + ... + 1581722.

It is an arithmetic number, because the mean of its divisors is an integer number (430945515).

Almost surely, 2^10001721312 is an apocalyptic number.

10001721312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

10001721312 is an abundant number, since it is smaller than the sum of its proper divisors (21026355768).

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

10001721312 is a wasteful number, since it uses less digits than its factorization.

10001721312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157136 (or 3157125 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The spelling of 10001721312 in words is "ten billion, one million, seven hundred twenty-one thousand, three hundred twelve".