221621325269 has 2 divisors, whose sum is σ = 221621325270. Its totient is φ = 221621325268.

The previous prime is 221621325221. The next prime is 221621325281. The reversal of 221621325269 is 962523126122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115693859044 + 105927466225 = 340138^2 + 325465^2 .

It is a cyclic number.

It is not a de Polignac number, because 221621325269 - 2²⁰ = 221620276693 is a prime.

It is a super-2 number, since 2×221621325269² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221621325209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110810662634 + 110810662635.

It is an arithmetic number, because the mean of its divisors is an integer number (110810662635).

Almost surely, 2^221621325269 is an apocalyptic number.

It is an amenable number.

221621325269 is a deficient number, since it is larger than the sum of its proper divisors (1).

221621325269 is an equidigital number, since it uses as much as digits as its factorization.

221621325269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 41.

It can be divided in two parts, 22162 and 1325269, that added together give a palindrome (1347431).

The spelling of 221621325269 in words is "two hundred twenty-one billion, six hundred twenty-one million, three hundred twenty-five thousand, two hundred sixty-nine".