1224001421 has 2 divisors, whose sum is σ = 1224001422. Its totient is φ = 1224001420.

The previous prime is 1224001409. The next prime is 1224001453. The reversal of 1224001421 is 1241004221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1185424900 + 38576521 = 34430^2 + 6211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224001421 - 2¹⁸ = 1223739277 is a prime.

It is a super-2 number, since 2×1224001421² = 2996358957220038482, 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 1224001421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1226001421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612000710 + 612000711.

It is an arithmetic number, because the mean of its divisors is an integer number (612000711).

Almost surely, 2^1224001421 is an apocalyptic number.

It is an amenable number.

1224001421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224001421 is an equidigital number, since it uses as much as digits as its factorization.

1224001421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1224001421 is about 34985.7316773567. The cubic root of 1224001421 is about 1069.6966622015.

Adding to 1224001421 its reverse (1241004221), we get a palindrome (2465005642).

The spelling of 1224001421 in words is "one billion, two hundred twenty-four million, one thousand, four hundred twenty-one".