20021222120 has 32 divisors (see below), whose sum is σ = 45192625920. Its totient is φ = 7982733120.

The previous prime is 20021222119. The next prime is 20021222129. The reversal of 20021222120 is 2122212002.

It is a junction number, because it is equal to n+sod(n) for n = 20021222095 and 20021222104.

It is not an unprimeable number, because it can be changed into a prime (20021222129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 792272 + ... + 817151.

It is an arithmetic number, because the mean of its divisors is an integer number (1412269560).

Almost surely, 2^20021222120 is an apocalyptic number.

20021222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021222120 is an abundant number, since it is smaller than the sum of its proper divisors (25171403800).

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

20021222120 is a wasteful number, since it uses less digits than its factorization.

20021222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609745 (or 1609741 counting only the distinct ones).

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

Adding to 20021222120 its reverse (2122212002), we get a palindrome (22143434122).

The spelling of 20021222120 in words is "twenty billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty".