1252052221 has 4 divisors (see below), whose sum is σ = 1430916832. Its totient is φ = 1073187612.

The previous prime is 1252052209. The next prime is 1252052237. The reversal of 1252052221 is 1222502521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1222502521 = 17 ⋅71911913.

It is not a de Polignac number, because 1252052221 - 2¹⁷ = 1251921149 is a prime.

It is a super-2 number, since 2×1252052221² = 3135269528222065682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1252052192 and 1252052201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252052251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89432295 + ... + 89432308.

It is an arithmetic number, because the mean of its divisors is an integer number (357729208).

Almost surely, 2^1252052221 is an apocalyptic number.

It is an amenable number.

1252052221 is a deficient number, since it is larger than the sum of its proper divisors (178864611).

1252052221 is an equidigital number, since it uses as much as digits as its factorization.

1252052221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178864610.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1252052221 is about 35384.3499445730. The cubic root of 1252052221 is about 1077.8065395067.

Adding to 1252052221 its reverse (1222502521), we get a palindrome (2474554742).

The spelling of 1252052221 in words is "one billion, two hundred fifty-two million, fifty-two thousand, two hundred twenty-one".