1252021113 has 12 divisors (see below), whose sum is σ = 2066828608. Its totient is φ = 715440600.

The previous prime is 1252021079. The next prime is 1252021139. The reversal of 1252021113 is 3111202521.

1252021113 is a `hidden beast` number, since 12 + 520 + 21 + 113 = 666.

It is not a de Polignac number, because 1252021113 - 2¹³ = 1252012921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1252021163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9936613 + ... + 9936738.

Almost surely, 2^1252021113 is an apocalyptic number.

It is an amenable number.

1252021113 is a deficient number, since it is larger than the sum of its proper divisors (814807495).

1252021113 is a wasteful number, since it uses less digits than its factorization.

1252021113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19873364 (or 19873361 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1252021113 is about 35383.9103689799. The cubic root of 1252021113 is about 1077.7976131795.

Adding to 1252021113 its reverse (3111202521), we get a palindrome (4363223634).

It can be divided in two parts, 12520 and 21113, that added together give a palindrome (33633).

The spelling of 1252021113 in words is "one billion, two hundred fifty-two million, twenty-one thousand, one hundred thirteen".