20210444142221 has 2 divisors, whose sum is σ = 20210444142222. Its totient is φ = 20210444142220.

The previous prime is 20210444142199. The next prime is 20210444142233. The reversal of 20210444142221 is 12224144401202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19242215694025 + 968228448196 = 4386595^2 + 983986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210444142221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210444142241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105222071110 + 10105222071111.

It is an arithmetic number, because the mean of its divisors is an integer number (10105222071111).

Almost surely, 2^{20210444142221} is an apocalyptic number.

It is an amenable number.

20210444142221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210444142221 is an equidigital number, since it uses as much as digits as its factorization.

20210444142221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 20210444142221 its reverse (12224144401202), we get a palindrome (32434588543423).

The spelling of 20210444142221 in words is "twenty trillion, two hundred ten billion, four hundred forty-four million, one hundred forty-two thousand, two hundred twenty-one".