1043221021 has 16 divisors (see below), whose sum is σ = 1103989248. Its totient is φ = 984456000.

The previous prime is 1043221019. The next prime is 1043221043. The reversal of 1043221021 is 1201223401.

It is a cyclic number.

It is not a de Polignac number, because 1043221021 - 2¹ = 1043221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1043220986 and 1043221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043221001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207291 + ... + 212263.

It is an arithmetic number, because the mean of its divisors is an integer number (68999328).

Almost surely, 2^1043221021 is an apocalyptic number.

It is an amenable number.

1043221021 is a deficient number, since it is larger than the sum of its proper divisors (60768227).

1043221021 is a wasteful number, since it uses less digits than its factorization.

1043221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1043221021 is about 32298.9321959721. The cubic root of 1043221021 is about 1014.2042898551.

Adding to 1043221021 its reverse (1201223401), we get a palindrome (2244444422).

The spelling of 1043221021 in words is "one billion, forty-three million, two hundred twenty-one thousand, twenty-one".