12021764420 has 24 divisors (see below), whose sum is σ = 25291053144. Its totient is φ = 4800068096.

The previous prime is 12021764411. The next prime is 12021764437. The reversal of 12021764420 is 2446712021.

It can be written as a sum of positive squares in 4 ways, for example, as 121572676 + 11900191744 = 11026^2 + 109088^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528437 + ... + 550716.

It is an arithmetic number, because the mean of its divisors is an integer number (1053793881).

Almost surely, 2^12021764420 is an apocalyptic number.

12021764420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021764420 is an abundant number, since it is smaller than the sum of its proper divisors (13269288724).

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

12021764420 is a wasteful number, since it uses less digits than its factorization.

12021764420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079719 (or 1079717 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The spelling of 12021764420 in words is "twelve billion, twenty-one million, seven hundred sixty-four thousand, four hundred twenty".