20021220212120 has 16 divisors (see below), whose sum is σ = 45047745477360. Its totient is φ = 8008488084832.

The previous prime is 20021220212113. The next prime is 20021220212171. The reversal of 20021220212120 is 2121202212002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250265252612 + ... + 250265252691.

It is an arithmetic number, because the mean of its divisors is an integer number (2815484092335).

Almost surely, 2^{20021220212120} is an apocalyptic number.

20021220212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021220212120 is an abundant number, since it is smaller than the sum of its proper divisors (25026525265240).

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

20021220212120 is a wasteful number, since it uses less digits than its factorization.

20021220212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500530505314 (or 500530505310 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20021220212120 its reverse (2121202212002), we get a palindrome (22142422424122).

The spelling of 20021220212120 in words is "twenty trillion, twenty-one billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty".