220268821 has 2 divisors, whose sum is σ = 220268822. Its totient is φ = 220268820.

The previous prime is 220268819. The next prime is 220268831. The reversal of 220268821 is 128862022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220195921 + 72900 = 14839^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 220268821 - 2¹ = 220268819 is a prime.

Together with 220268819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220268801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110134410 + 110134411.

It is an arithmetic number, because the mean of its divisors is an integer number (110134411).

Almost surely, 2^220268821 is an apocalyptic number.

It is an amenable number.

220268821 is a deficient number, since it is larger than the sum of its proper divisors (1).

220268821 is an equidigital number, since it uses as much as digits as its factorization.

220268821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 220268821 is about 14841.4561617114. The cubic root of 220268821 is about 603.9268556441.

The spelling of 220268821 in words is "two hundred twenty million, two hundred sixty-eight thousand, eight hundred twenty-one".