12721106644 has 6 divisors (see below), whose sum is σ = 22261936634. Its totient is φ = 6360553320.

The previous prime is 12721106633. The next prime is 12721106719. The reversal of 12721106644 is 44660112721.

It can be written as a sum of positive squares in only one way, i.e., 7371939600 + 5349167044 = 85860^2 + 73138^2 .

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, 1590138327 + ... + 1590138334.

Almost surely, 2^12721106644 is an apocalyptic number.

It is an amenable number.

12721106644 is a deficient number, since it is larger than the sum of its proper divisors (9540829990).

12721106644 is a wasteful number, since it uses less digits than its factorization.

12721106644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3180276665 (or 3180276663 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 12721106644 in words is "twelve billion, seven hundred twenty-one million, one hundred six thousand, six hundred forty-four".