12212220420 has 96 divisors (see below), whose sum is σ = 38012083200. Its totient is φ = 3255005952.

The previous prime is 12212220413. The next prime is 12212220437. The reversal of 12212220420 is 2402221221.

12212220420 is a `hidden beast` number, since 1 + 2 + 21 + 2 + 220 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12212220393 and 12212220402.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1469517 + ... + 1477803.

It is an arithmetic number, because the mean of its divisors is an integer number (395959200).

Almost surely, 2^12212220420 is an apocalyptic number.

12212220420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212220420 is an abundant number, since it is smaller than the sum of its proper divisors (25799862780).

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

12212220420 is a wasteful number, since it uses less digits than its factorization.

12212220420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11034 (or 11026 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 12212220420 its reverse (2402221221), we get a palindrome (14614441641).

The spelling of 12212220420 in words is "twelve billion, two hundred twelve million, two hundred twenty thousand, four hundred twenty".