20349822221 has 2 divisors, whose sum is σ = 20349822222. Its totient is φ = 20349822220.

The previous prime is 20349822193. The next prime is 20349822257. The reversal of 20349822221 is 12222894302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18902400196 + 1447422025 = 137486^2 + 38045^2 .

It is a cyclic number.

It is not a de Polignac number, because 20349822221 - 2¹⁰ = 20349821197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20349822271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10174911110 + 10174911111.

It is an arithmetic number, because the mean of its divisors is an integer number (10174911111).

Almost surely, 2^20349822221 is an apocalyptic number.

It is an amenable number.

20349822221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20349822221 is an equidigital number, since it uses as much as digits as its factorization.

20349822221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 20349822221 in words is "twenty billion, three hundred forty-nine million, eight hundred twenty-two thousand, two hundred twenty-one".