1045313021 has 4 divisors (see below), whose sum is σ = 1045381344. Its totient is φ = 1045244700.

The previous prime is 1045312979. The next prime is 1045313023. The reversal of 1045313021 is 1203135401.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1045313021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1045312984 and 1045313002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045313023) 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, 536 + ... + 45726.

It is an arithmetic number, because the mean of its divisors is an integer number (261345336).

Almost surely, 2^1045313021 is an apocalyptic number.

It is an amenable number.

1045313021 is a deficient number, since it is larger than the sum of its proper divisors (68323).

1045313021 is an equidigital number, since it uses as much as digits as its factorization.

1045313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68322.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1045313021 is about 32331.3009481524. The cubic root of 1045313021 is about 1014.8817745123.

Adding to 1045313021 its reverse (1203135401), we get a palindrome (2248448422).

The spelling of 1045313021 in words is "one billion, forty-five million, three hundred thirteen thousand, twenty-one".