20021200122220 has 36 divisors (see below), whose sum is σ = 46214224750512. Its totient is φ = 7280436407200.

The previous prime is 20021200122173. The next prime is 20021200122221. The reversal of 20021200122220 is 2222100212002.

It is a junction number, because it is equal to n+sod(n) for n = 20021200122194 and 20021200122203.

It is not an unprimeable number, because it can be changed into a prime (20021200122221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4136609176 + ... + 4136614015.

It is an arithmetic number, because the mean of its divisors is an integer number (1283728465292).

Almost surely, 2^{20021200122220} is an apocalyptic number.

20021200122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021200122220 is an abundant number, since it is smaller than the sum of its proper divisors (26193024628292).

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

20021200122220 is a wasteful number, since it uses less digits than its factorization.

20021200122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8273223222 (or 8273223209 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20021200122220 its reverse (2222100212002), we get a palindrome (22243300334222).

The spelling of 20021200122220 in words is "twenty trillion, twenty-one billion, two hundred million, one hundred twenty-two thousand, two hundred twenty".