220202422421 has 2 divisors, whose sum is σ = 220202422422. Its totient is φ = 220202422420.

The previous prime is 220202422403. The next prime is 220202422459. The reversal of 220202422421 is 124224202022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131559269521 + 88643152900 = 362711^2 + 297730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220202422421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220202422471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110101211210 + 110101211211.

It is an arithmetic number, because the mean of its divisors is an integer number (110101211211).

Almost surely, 2^220202422421 is an apocalyptic number.

It is an amenable number.

220202422421 is a deficient number, since it is larger than the sum of its proper divisors (1).

220202422421 is an equidigital number, since it uses as much as digits as its factorization.

220202422421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 220202422421 its reverse (124224202022), we get a palindrome (344426624443).

The spelling of 220202422421 in words is "two hundred twenty billion, two hundred two million, four hundred twenty-two thousand, four hundred twenty-one".