2020121231221 has 2 divisors, whose sum is σ = 2020121231222. Its totient is φ = 2020121231220.

The previous prime is 2020121231207. The next prime is 2020121231257. The reversal of 2020121231221 is 1221321210202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2009561408100 + 10559823121 = 1417590^2 + 102761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020121231221 - 2⁵ = 2020121231189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020121231521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010060615610 + 1010060615611.

It is an arithmetic number, because the mean of its divisors is an integer number (1010060615611).

Almost surely, 2^{2020121231221} is an apocalyptic number.

It is an amenable number.

2020121231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020121231221 is an equidigital number, since it uses as much as digits as its factorization.

2020121231221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2020121231221 its reverse (1221321210202), we get a palindrome (3241442441423).

The spelling of 2020121231221 in words is "two trillion, twenty billion, one hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty-one".