12021322664 has 16 divisors (see below), whose sum is σ = 24273824820. Its totient is φ = 5548302720.

The previous prime is 12021322601. The next prime is 12021322699. The reversal of 12021322664 is 46622312021.

It can be written as a sum of positive squares in 2 ways, for example, as 9751562500 + 2269760164 = 98750^2 + 47642^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57794717 + ... + 57794924.

Almost surely, 2^12021322664 is an apocalyptic number.

It is an amenable number.

12021322664 is an abundant number, since it is smaller than the sum of its proper divisors (12252502156).

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

12021322664 is a wasteful number, since it uses less digits than its factorization.

12021322664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115589660 (or 115589656 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 12021322664 its reverse (46622312021), we get a palindrome (58643634685).

The spelling of 12021322664 in words is "twelve billion, twenty-one million, three hundred twenty-two thousand, six hundred sixty-four".