252111552221 has 2 divisors, whose sum is σ = 252111552222. Its totient is φ = 252111552220.

The previous prime is 252111552191. The next prime is 252111552241. The reversal of 252111552221 is 122255111252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236979108025 + 15132444196 = 486805^2 + 123014^2 .

It is a cyclic number.

It is not a de Polignac number, because 252111552221 - 2²² = 252107357917 is a prime.

It is a super-3 number, since 3×252111552221³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252111552241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126055776110 + 126055776111.

It is an arithmetic number, because the mean of its divisors is an integer number (126055776111).

Almost surely, 2^252111552221 is an apocalyptic number.

It is an amenable number.

252111552221 is a deficient number, since it is larger than the sum of its proper divisors (1).

252111552221 is an equidigital number, since it uses as much as digits as its factorization.

252111552221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000, while the sum is 29.

Adding to 252111552221 its reverse (122255111252), we get a palindrome (374366663473).

The spelling of 252111552221 in words is "two hundred fifty-two billion, one hundred eleven million, five hundred fifty-two thousand, two hundred twenty-one".