12021220994 has 16 divisors (see below), whose sum is σ = 18103349880. Its totient is φ = 5986794240.

The previous prime is 12021220993. The next prime is 12021221021. The reversal of 12021220994 is 49902212021.

It can be written as a sum of positive squares in 4 ways, for example, as 11984775625 + 36445369 = 109475^2 + 6037^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12021220994.

It is not an unprimeable number, because it can be changed into a prime (12021220993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1325114 + ... + 1334154.

Almost surely, 2^12021220994 is an apocalyptic number.

12021220994 is a deficient number, since it is larger than the sum of its proper divisors (6082128886).

12021220994 is a wasteful number, since it uses less digits than its factorization.

12021220994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11605.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 12021220994 in words is "twelve billion, twenty-one million, two hundred twenty thousand, nine hundred ninety-four".