20444534221 has 2 divisors, whose sum is σ = 20444534222. Its totient is φ = 20444534220.

The previous prime is 20444534179. The next prime is 20444534233. The reversal of 20444534221 is 12243544402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20338752996 + 105781225 = 142614^2 + 10285^2 .

It is a cyclic number.

It is not a de Polignac number, because 20444534221 - 2²¹ = 20442437069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20444534251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10222267110 + 10222267111.

It is an arithmetic number, because the mean of its divisors is an integer number (10222267111).

Almost surely, 2^20444534221 is an apocalyptic number.

It is an amenable number.

20444534221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20444534221 is an equidigital number, since it uses as much as digits as its factorization.

20444534221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 31.

The spelling of 20444534221 in words is "twenty billion, four hundred forty-four million, five hundred thirty-four thousand, two hundred twenty-one".