1145021521 has 4 divisors (see below), whose sum is σ = 1308596032. Its totient is φ = 981447012.

The previous prime is 1145021513. The next prime is 1145021531. The reversal of 1145021521 is 1251205411.

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.

It is not a de Polignac number, because 1145021521 - 2³ = 1145021513 is a prime.

It is a super-2 number, since 2×1145021521² = 2622148567106306882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1145021492 and 1145021501.

It is not an unprimeable number, because it can be changed into a prime (1145021531) 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, 81787245 + ... + 81787258.

It is an arithmetic number, because the mean of its divisors is an integer number (327149008).

Almost surely, 2^1145021521 is an apocalyptic number.

It is an amenable number.

1145021521 is a deficient number, since it is larger than the sum of its proper divisors (163574511).

1145021521 is an equidigital number, since it uses as much as digits as its factorization.

1145021521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163574510.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1145021521 is about 33838.1666317784. The cubic root of 1145021521 is about 1046.1755110461.

Adding to 1145021521 its reverse (1251205411), we get a palindrome (2396226932).

The spelling of 1145021521 in words is "one billion, one hundred forty-five million, twenty-one thousand, five hundred twenty-one".