2120211231221 has 2 divisors, whose sum is σ = 2120211231222. Its totient is φ = 2120211231220.

The previous prime is 2120211231217. The next prime is 2120211231227. The reversal of 2120211231221 is 1221321120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1960319212996 + 159892018225 = 1400114^2 + 399865^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120211231221 - 2² = 2120211231217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120211231193 and 2120211231202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120211231227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060105615610 + 1060105615611.

It is an arithmetic number, because the mean of its divisors is an integer number (1060105615611).

Almost surely, 2^{2120211231221} is an apocalyptic number.

It is an amenable number.

2120211231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120211231221 is an equidigital number, since it uses as much as digits as its factorization.

2120211231221 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 20.

Adding to 2120211231221 its reverse (1221321120212), we get a palindrome (3341532351433).

The spelling of 2120211231221 in words is "two trillion, one hundred twenty billion, two hundred eleven million, two hundred thirty-one thousand, two hundred twenty-one".