220221022220621 has 2 divisors, whose sum is σ = 220221022220622. Its totient is φ = 220221022220620.

The previous prime is 220221022220561. The next prime is 220221022220623. The reversal of 220221022220621 is 126022220122022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212276595181225 + 7944427039396 = 14569715^2 + 2818586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220221022220621 is a prime.

Together with 220221022220623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220221022220623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110110511110310 + 110110511110311.

It is an arithmetic number, because the mean of its divisors is an integer number (110110511110311).

Almost surely, 2^{220221022220621} is an apocalyptic number.

It is an amenable number.

220221022220621 is a deficient number, since it is larger than the sum of its proper divisors (1).

220221022220621 is an equidigital number, since it uses as much as digits as its factorization.

220221022220621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 220221022220621 its reverse (126022220122022), we get a palindrome (346243242342643).

The spelling of 220221022220621 in words is "two hundred twenty trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty thousand, six hundred twenty-one".