20200121211220 has 24 divisors (see below), whose sum is σ = 42654620598408. Its totient is φ = 8035407331200.

The previous prime is 20200121211169. The next prime is 20200121211239. The reversal of 20200121211220 is 2211212100202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 292693984144 + 19907427227076 = 541012^2 + 4461774^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20200121211194 and 20200121211203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2790068371 + ... + 2790075610.

It is an arithmetic number, because the mean of its divisors is an integer number (1777275858267).

Almost surely, 2^{20200121211220} is an apocalyptic number.

20200121211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20200121211220 is an abundant number, since it is smaller than the sum of its proper divisors (22454499387188).

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

20200121211220 is a wasteful number, since it uses less digits than its factorization.

20200121211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5580144171 (or 5580144169 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20200121211220 its reverse (2211212100202), we get a palindrome (22411333311422).

The spelling of 20200121211220 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty".