20361402221 has 2 divisors, whose sum is σ = 20361402222. Its totient is φ = 20361402220.

The previous prime is 20361402161. The next prime is 20361402277. The reversal of 20361402221 is 12220416302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12933375625 + 7428026596 = 113725^2 + 86186^2 .

It is a cyclic number.

It is not a de Polignac number, because 20361402221 - 2¹⁰ = 20361401197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20361402521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10180701110 + 10180701111.

It is an arithmetic number, because the mean of its divisors is an integer number (10180701111).

Almost surely, 2^20361402221 is an apocalyptic number.

It is an amenable number.

20361402221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20361402221 is an equidigital number, since it uses as much as digits as its factorization.

20361402221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20361402221 its reverse (12220416302), we get a palindrome (32581818523).

The spelling of 20361402221 in words is "twenty billion, three hundred sixty-one million, four hundred two thousand, two hundred twenty-one".