220821607 has 2 divisors, whose sum is σ = 220821608. Its totient is φ = 220821606.

The previous prime is 220821581. The next prime is 220821617. The reversal of 220821607 is 706128022.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220821607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220821617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110410803 + 110410804.

It is an arithmetic number, because the mean of its divisors is an integer number (110410804).

Almost surely, 2^220821607 is an apocalyptic number.

220821607 is a deficient number, since it is larger than the sum of its proper divisors (1).

220821607 is an equidigital number, since it uses as much as digits as its factorization.

220821607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 220821607 is about 14860.0675301292. The cubic root of 220821607 is about 604.4316379795.

Adding to 220821607 its reverse (706128022), we get a palindrome (926949629).

The spelling of 220821607 in words is "two hundred twenty million, eight hundred twenty-one thousand, six hundred seven".