221161253 has 2 divisors, whose sum is σ = 221161254. Its totient is φ = 221161252.

The previous prime is 221161249. The next prime is 221161267. The reversal of 221161253 is 352161122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150970369 + 70190884 = 12287^2 + 8378^2 .

It is a cyclic number.

It is not a de Polignac number, because 221161253 - 2² = 221161249 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221161153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110580626 + 110580627.

It is an arithmetic number, because the mean of its divisors is an integer number (110580627).

Almost surely, 2^221161253 is an apocalyptic number.

It is an amenable number.

221161253 is a deficient number, since it is larger than the sum of its proper divisors (1).

221161253 is an equidigital number, since it uses as much as digits as its factorization.

221161253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 221161253 is about 14871.4912836608. The cubic root of 221161253 is about 604.7413715952.

The spelling of 221161253 in words is "two hundred twenty-one million, one hundred sixty-one thousand, two hundred fifty-three".