1021253443 has 12 divisors (see below), whose sum is σ = 1195564512. Its totient is φ = 869778000.

The previous prime is 1021253437. The next prime is 1021253503. The reversal of 1021253443 is 3443521201.

It is not a de Polignac number, because 1021253443 - 2²¹ = 1019156291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021253143) 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, 58683 + ... + 74068.

It is an arithmetic number, because the mean of its divisors is an integer number (99630376).

Almost surely, 2^1021253443 is an apocalyptic number.

1021253443 is a deficient number, since it is larger than the sum of its proper divisors (174311069).

1021253443 is a wasteful number, since it uses less digits than its factorization.

1021253443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132922 (or 132915 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1021253443 is about 31957.0562317620. The cubic root of 1021253443 is about 1007.0348754763.

Adding to 1021253443 its reverse (3443521201), we get a palindrome (4464774644).

The spelling of 1021253443 in words is "one billion, twenty-one million, two hundred fifty-three thousand, four hundred forty-three".