221620253 has 2 divisors, whose sum is σ = 221620254. Its totient is φ = 221620252.

The previous prime is 221620241. The next prime is 221620261. The reversal of 221620253 is 352026122.

221620253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136002244 + 85618009 = 11662^2 + 9253^2 .

It is a cyclic number.

It is not a de Polignac number, because 221620253 - 2⁸ = 221619997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221620213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110810126 + 110810127.

It is an arithmetic number, because the mean of its divisors is an integer number (110810127).

Almost surely, 2^221620253 is an apocalyptic number.

It is an amenable number.

221620253 is a deficient number, since it is larger than the sum of its proper divisors (1).

221620253 is an equidigital number, since it uses as much as digits as its factorization.

221620253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 221620253 is about 14886.9154965023. The cubic root of 221620253 is about 605.1594443495.

Adding to 221620253 its reverse (352026122), we get a palindrome (573646375).

The spelling of 221620253 in words is "two hundred twenty-one million, six hundred twenty thousand, two hundred fifty-three".