220006621 has 2 divisors, whose sum is σ = 220006622. Its totient is φ = 220006620.

The previous prime is 220006609. The next prime is 220006651. The reversal of 220006621 is 126600022.

220006621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145805625 + 74200996 = 12075^2 + 8614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220006621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220006651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110003310 + 110003311.

It is an arithmetic number, because the mean of its divisors is an integer number (110003311).

Almost surely, 2^220006621 is an apocalyptic number.

It is an amenable number.

220006621 is a deficient number, since it is larger than the sum of its proper divisors (1).

220006621 is an equidigital number, since it uses as much as digits as its factorization.

220006621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 220006621 is about 14832.6201663765. The cubic root of 220006621 is about 603.6871296378.

Adding to 220006621 its reverse (126600022), we get a palindrome (346606643).

The spelling of 220006621 in words is "two hundred twenty million, six thousand, six hundred twenty-one".