20021221112120 has 64 divisors (see below), whose sum is σ = 47085615213120. Its totient is φ = 7647375222784.

The previous prime is 20021221112089. The next prime is 20021221112131. The reversal of 20021221112120 is 2121112212002.

It is a super-2 number, since 2×20021221112120² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17803679 + ... + 18894798.

It is an arithmetic number, because the mean of its divisors is an integer number (735712737705).

Almost surely, 2^{20021221112120} is an apocalyptic number.

20021221112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021221112120 is an abundant number, since it is smaller than the sum of its proper divisors (27064394101000).

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

20021221112120 is a wasteful number, since it uses less digits than its factorization.

20021221112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36699104 (or 36699100 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20021221112120 its reverse (2121112212002), we get a palindrome (22142333324122).

The spelling of 20021221112120 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred twenty".