21220412120 has 32 divisors (see below), whose sum is σ = 48183973200. Its totient is φ = 8410290048.

The previous prime is 21220412117. The next prime is 21220412159. The reversal of 21220412120 is 2121402212.

It is a congruent number.

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, 2429174 + ... + 2437893.

Almost surely, 2^21220412120 is an apocalyptic number.

21220412120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220412120 is an abundant number, since it is smaller than the sum of its proper divisors (26963561080).

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

21220412120 is a wasteful number, since it uses less digits than its factorization.

21220412120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4867187 (or 4867183 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220412120 its reverse (2121402212), we get a palindrome (23341814332).

The spelling of 21220412120 in words is "twenty-one billion, two hundred twenty million, four hundred twelve thousand, one hundred twenty".