2231021 has 4 divisors (see below), whose sum is σ = 2402652. Its totient is φ = 2059392.

The previous prime is 2231011. The next prime is 2231027. The reversal of 2231021 is 1201322.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 990025 + 1240996 = 995^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231021 - 2¹⁴ = 2214637 is a prime.

It is a super-3 number, since 3×2231021³ = 33314417903083866783, which contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2230993 and 2231011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231027) 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, 85796 + ... + 85821.

It is an arithmetic number, because the mean of its divisors is an integer number (600663).

2^2231021 is an apocalyptic number.

It is an amenable number.

2231021 is a deficient number, since it is larger than the sum of its proper divisors (171631).

2231021 is a wasteful number, since it uses less digits than its factorization.

2231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171630.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2231021 is about 1493.6602692714. The cubic root of 2231021 is about 130.6675914773.

Adding to 2231021 its reverse (1201322), we get a palindrome (3432343).

The spelling of 2231021 in words is "two million, two hundred thirty-one thousand, twenty-one".