1244430021 has 8 divisors (see below), whose sum is σ = 1662069024. Its totient is φ = 828205520.

The previous prime is 1244429987. The next prime is 1244430053. The reversal of 1244430021 is 1200344421.

1244430021 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1244430021 - 2⁹ = 1244429509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1244430021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244430071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351570 + ... + 355091.

It is an arithmetic number, because the mean of its divisors is an integer number (207758628).

Almost surely, 2^1244430021 is an apocalyptic number.

It is an amenable number.

1244430021 is a deficient number, since it is larger than the sum of its proper divisors (417639003).

1244430021 is an equidigital number, since it uses as much as digits as its factorization.

1244430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707251.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1244430021 is about 35276.4797138263. The cubic root of 1244430021 is about 1075.6149417625.

Adding to 1244430021 its reverse (1200344421), we get a palindrome (2444774442).

The spelling of 1244430021 in words is "one billion, two hundred forty-four million, four hundred thirty thousand, twenty-one".