1252220521 has 4 divisors (see below), whose sum is σ = 1257595092. Its totient is φ = 1246845952.

The previous prime is 1252220509. The next prime is 1252220531. The reversal of 1252220521 is 1250222521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 145926400 + 1106294121 = 12080^2 + 33261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252220521 - 2¹³ = 1252212329 is a prime.

It is a super-2 number, since 2×1252220521² = 3136112466427022882, 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 = 1252220492 and 1252220501.

It is not an unprimeable number, because it can be changed into a prime (1252220531) 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, 2686936 + ... + 2687401.

It is an arithmetic number, because the mean of its divisors is an integer number (314398773).

Almost surely, 2^1252220521 is an apocalyptic number.

It is an amenable number.

1252220521 is a deficient number, since it is larger than the sum of its proper divisors (5374571).

1252220521 is an equidigital number, since it uses as much as digits as its factorization.

1252220521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374570.

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

The square root of 1252220521 is about 35386.7280346742. The cubic root of 1252220521 is about 1077.8548300148.

The spelling of 1252220521 in words is "one billion, two hundred fifty-two million, two hundred twenty thousand, five hundred twenty-one".