1252353021 has 4 divisors (see below), whose sum is σ = 1669804032. Its totient is φ = 834902012.

The previous prime is 1252353019. The next prime is 1252353071. The reversal of 1252353021 is 1203532521.

It is a happy number.

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: 1203532521 = 3 ⋅401177507.

It is a cyclic number.

It is not a de Polignac number, because 1252353021 - 2¹ = 1252353019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1252352982 and 1252353000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252353071) 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, 208725501 + ... + 208725506.

It is an arithmetic number, because the mean of its divisors is an integer number (417451008).

Almost surely, 2^1252353021 is an apocalyptic number.

It is an amenable number.

1252353021 is a deficient number, since it is larger than the sum of its proper divisors (417451011).

1252353021 is an equidigital number, since it uses as much as digits as its factorization.

1252353021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417451010.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1252353021 is about 35388.6001559824. The cubic root of 1252353021 is about 1077.8928453445.

Adding to 1252353021 its reverse (1203532521), we get a palindrome (2455885542).

The spelling of 1252353021 in words is "one billion, two hundred fifty-two million, three hundred fifty-three thousand, twenty-one".