20021220022120 has 64 divisors (see below), whose sum is σ = 45073650258000. Its totient is φ = 8003884075008.

The previous prime is 20021220022117. The next prime is 20021220022129. The reversal of 20021220022120 is 2122002212002.

It can be written as a sum of positive squares in 8 ways, for example, as 16752927325156 + 3268292696964 = 4093034^2 + 1807842^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20021220022094 and 20021220022103.

It is not an unprimeable number, because it can be changed into a prime (20021220022129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532616286 + ... + 532653874.

Almost surely, 2^{20021220022120} is an apocalyptic number.

20021220022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021220022120 is an abundant number, since it is smaller than the sum of its proper divisors (25052430235880).

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

20021220022120 is a wasteful number, since it uses less digits than its factorization.

20021220022120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44902 (or 44898 counting only the distinct ones).

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

Adding to 20021220022120 its reverse (2122002212002), we get a palindrome (22143222234122).

The spelling of 20021220022120 in words is "twenty trillion, twenty-one billion, two hundred twenty million, twenty-two thousand, one hundred twenty".