2443261021 has 4 divisors (see below), whose sum is σ = 2449708000. Its totient is φ = 2436814044.

The previous prime is 2443260979. The next prime is 2443261031. The reversal of 2443261021 is 1201623442.

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 2443261021 - 2²⁵ = 2409706589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2443261031) 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, 3222921 + ... + 3223678.

It is an arithmetic number, because the mean of its divisors is an integer number (612427000).

Almost surely, 2^2443261021 is an apocalyptic number.

It is an amenable number.

2443261021 is a deficient number, since it is larger than the sum of its proper divisors (6446979).

2443261021 is an equidigital number, since it uses as much as digits as its factorization.

2443261021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6446978.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 2443261021 is about 49429.3538395962. The cubic root of 2443261021 is about 1346.8625855026.

Adding to 2443261021 its reverse (1201623442), we get a palindrome (3644884463).

The spelling of 2443261021 in words is "two billion, four hundred forty-three million, two hundred sixty-one thousand, twenty-one".