21202220120 has 32 divisors (see below), whose sum is σ = 48868535520. Its totient is φ = 8274036480.

The previous prime is 21202220077. The next prime is 21202220183. The reversal of 21202220120 is 2102220212.

It is a junction number, because it is equal to n+sod(n) for n = 21202220095 and 21202220104.

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, 6462452 + ... + 6465731.

It is an arithmetic number, because the mean of its divisors is an integer number (1527141735).

Almost surely, 2^21202220120 is an apocalyptic number.

21202220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202220120 is an abundant number, since it is smaller than the sum of its proper divisors (27666315400).

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

21202220120 is a wasteful number, since it uses less digits than its factorization.

21202220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12928235 (or 12928231 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21202220120 its reverse (2102220212), we get a palindrome (23304440332).

The spelling of 21202220120 in words is "twenty-one billion, two hundred two million, two hundred twenty thousand, one hundred twenty".