12420021772 has 24 divisors (see below), whose sum is σ = 23134083840. Its totient is φ = 5814109440.

The previous prime is 12420021767. The next prime is 12420021793. The reversal of 12420021772 is 27712002421.

It is a self number, because there is not a number n which added to its sum of digits gives 12420021772.

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, 465147 + ... + 491122.

It is an arithmetic number, because the mean of its divisors is an integer number (963920160).

Almost surely, 2^12420021772 is an apocalyptic number.

It is an amenable number.

12420021772 is a deficient number, since it is larger than the sum of its proper divisors (10714062068).

12420021772 is a wasteful number, since it uses less digits than its factorization.

12420021772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956481 (or 956479 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The spelling of 12420021772 in words is "twelve billion, four hundred twenty million, twenty-one thousand, seven hundred seventy-two".