220302121421 has 2 divisors, whose sum is σ = 220302121422. Its totient is φ = 220302121420.

The previous prime is 220302121343. The next prime is 220302121447. The reversal of 220302121421 is 124121203022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193006455625 + 27295665796 = 439325^2 + 165214^2 .

It is a cyclic number.

It is not a de Polignac number, because 220302121421 - 2³⁰ = 219228379597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220302121393 and 220302121402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220302121021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110151060710 + 110151060711.

It is an arithmetic number, because the mean of its divisors is an integer number (110151060711).

Almost surely, 2^220302121421 is an apocalyptic number.

It is an amenable number.

220302121421 is a deficient number, since it is larger than the sum of its proper divisors (1).

220302121421 is an equidigital number, since it uses as much as digits as its factorization.

220302121421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 220302121421 its reverse (124121203022), we get a palindrome (344423324443).

The spelling of 220302121421 in words is "two hundred twenty billion, three hundred two million, one hundred twenty-one thousand, four hundred twenty-one".