1145001021 has 4 divisors (see below), whose sum is σ = 1526668032. Its totient is φ = 763334012.

The previous prime is 1145000999. The next prime is 1145001041. The reversal of 1145001021 is 1201005411.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1145001021 - 2¹⁷ = 1144869949 is a prime.

It is a super-2 number, since 2×1145001021² = 2622054676182084882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145001041) 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, 190833501 + ... + 190833506.

It is an arithmetic number, because the mean of its divisors is an integer number (381667008).

Almost surely, 2^1145001021 is an apocalyptic number.

It is an amenable number.

1145001021 is a deficient number, since it is larger than the sum of its proper divisors (381667011).

1145001021 is an equidigital number, since it uses as much as digits as its factorization.

1145001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381667010.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1145001021 is about 33837.8637180304. The cubic root of 1145001021 is about 1046.1692675751.

Adding to 1145001021 its reverse (1201005411), we get a palindrome (2346006432).

The spelling of 1145001021 in words is "one billion, one hundred forty-five million, one thousand, twenty-one".