1252203021 has 12 divisors (see below), whose sum is σ = 1810084380. Its totient is φ = 834180480.

The previous prime is 1252203019. The next prime is 1252203031. The reversal of 1252203021 is 1203022521.

It can be written as a sum of positive squares in 2 ways, for example, as 474629796 + 777573225 = 21786^2 + 27885^2 .

It is not a de Polignac number, because 1252203021 - 2¹ = 1252203019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1252202985 and 1252203003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252203011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38866 + ... + 63363.

It is an arithmetic number, because the mean of its divisors is an integer number (150840365).

Almost surely, 2^1252203021 is an apocalyptic number.

It is an amenable number.

1252203021 is a deficient number, since it is larger than the sum of its proper divisors (557881359).

1252203021 is a wasteful number, since it uses less digits than its factorization.

1252203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103596 (or 103593 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1252203021 is about 35386.4807659648. The cubic root of 1252203021 is about 1077.8498089217.

Adding to 1252203021 its reverse (1203022521), we get a palindrome (2455225542).

The spelling of 1252203021 in words is "one billion, two hundred fifty-two million, two hundred three thousand, twenty-one".