1421002243 has 4 divisors (see below), whose sum is σ = 1421931928. Its totient is φ = 1420072560.

The previous prime is 1421002237. The next prime is 1421002249. The reversal of 1421002243 is 3422001241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3422001241 = 61 ⋅56098381.

It is an interprime number because it is at equal distance from previous prime (1421002237) and next prime (1421002249).

It is a cyclic number.

It is not a de Polignac number, because 1421002243 - 2⁹ = 1421001731 is a prime.

It is a super-2 number, since 2×1421002243² = 4038494749222062098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1421002243.

It is not an unprimeable number, because it can be changed into a prime (1421002249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462546 + ... + 465607.

It is an arithmetic number, because the mean of its divisors is an integer number (355482982).

Almost surely, 2^1421002243 is an apocalyptic number.

1421002243 is a deficient number, since it is larger than the sum of its proper divisors (929685).

1421002243 is an equidigital number, since it uses as much as digits as its factorization.

1421002243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929684.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1421002243 is about 37696.1834009758. The cubic root of 1421002243 is about 1124.2552418554.

Adding to 1421002243 its reverse (3422001241), we get a palindrome (4843003484).

The spelling of 1421002243 in words is "one billion, four hundred twenty-one million, two thousand, two hundred forty-three".