44002421 has 2 divisors, whose sum is σ = 44002422. Its totient is φ = 44002420.

The previous prime is 44002417. The next prime is 44002433. The reversal of 44002421 is 12420044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22193521 + 21808900 = 4711^2 + 4670^2 .

It is a cyclic number.

It is not a de Polignac number, because 44002421 - 2² = 44002417 is a prime.

It is a super-2 number, since 2×44002421² = 3872426107722482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 44002421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44001421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22001210 + 22001211.

It is an arithmetic number, because the mean of its divisors is an integer number (22001211).

Almost surely, 2^44002421 is an apocalyptic number.

It is an amenable number.

44002421 is a deficient number, since it is larger than the sum of its proper divisors (1).

44002421 is an equidigital number, since it uses as much as digits as its factorization.

44002421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 44002421 is about 6633.4320679419. The cubic root of 44002421 is about 353.0413083936.

Adding to 44002421 its reverse (12420044), we get a palindrome (56422465).

The spelling of 44002421 in words is "forty-four million, two thousand, four hundred twenty-one".