12021322651 has 4 divisors (see below), whose sum is σ = 12946039792. Its totient is φ = 11096605512.

The previous prime is 12021322601. The next prime is 12021322699. The reversal of 12021322651 is 15622312021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15622312021 = 4937 ⋅3164333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021322651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021322601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462358551 + ... + 462358576.

It is an arithmetic number, because the mean of its divisors is an integer number (3236509948).

Almost surely, 2^12021322651 is an apocalyptic number.

12021322651 is a deficient number, since it is larger than the sum of its proper divisors (924717141).

12021322651 is an equidigital number, since it uses as much as digits as its factorization.

12021322651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924717140.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 12021322651 its reverse (15622312021), we get a palindrome (27643634672).

The spelling of 12021322651 in words is "twelve billion, twenty-one million, three hundred twenty-two thousand, six hundred fifty-one".