244213421 has 2 divisors, whose sum is σ = 244213422. Its totient is φ = 244213420.

The previous prime is 244213399. The next prime is 244213429. The reversal of 244213421 is 124312442.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139948900 + 104264521 = 11830^2 + 10211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-244213421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (244213429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122106710 + 122106711.

It is an arithmetic number, because the mean of its divisors is an integer number (122106711).

Almost surely, 2^244213421 is an apocalyptic number.

It is an amenable number.

244213421 is a deficient number, since it is larger than the sum of its proper divisors (1).

244213421 is an equidigital number, since it uses as much as digits as its factorization.

244213421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 23.

The square root of 244213421 is about 15627.3292983798. The cubic root of 244213421 is about 625.0621130803.

Adding to 244213421 its reverse (124312442), we get a palindrome (368525863).

The spelling of 244213421 in words is "two hundred forty-four million, two hundred thirteen thousand, four hundred twenty-one".