1252800121 has 2 divisors, whose sum is σ = 1252800122. Its totient is φ = 1252800120.

The previous prime is 1252800119. The next prime is 1252800161. The reversal of 1252800121 is 1210082521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197506025 + 55294096 = 34605^2 + 7436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252800121 - 2¹ = 1252800119 is a prime.

It is a super-2 number, since 2×1252800121² = 3139016286355229282, which contains 22 as substring.

Together with 1252800119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1252800092 and 1252800101.

It is not a weakly prime, because it can be changed into another prime (1252800161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626400060 + 626400061.

It is an arithmetic number, because the mean of its divisors is an integer number (626400061).

Almost surely, 2^1252800121 is an apocalyptic number.

It is an amenable number.

1252800121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252800121 is an equidigital number, since it uses as much as digits as its factorization.

1252800121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 1252800121 is about 35394.9165982913. The cubic root of 1252800121 is about 1078.0211021922.

Adding to 1252800121 its reverse (1210082521), we get a palindrome (2462882642).

The spelling of 1252800121 in words is "one billion, two hundred fifty-two million, eight hundred thousand, one hundred twenty-one".