1242221423 has 2 divisors, whose sum is σ = 1242221424. Its totient is φ = 1242221422.

The previous prime is 1242221419. The next prime is 1242221437. The reversal of 1242221423 is 3241222421.

It is a weak prime.

It is an emirp because it is prime and its reverse (3241222421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242221423 - 2² = 1242221419 is a prime.

It is a super-2 number, since 2×1242221423² = 3086228127520289858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242281423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621110711 + 621110712.

It is an arithmetic number, because the mean of its divisors is an integer number (621110712).

Almost surely, 2^1242221423 is an apocalyptic number.

1242221423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242221423 is an equidigital number, since it uses as much as digits as its factorization.

1242221423 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 1242221423 is about 35245.1616963237. The cubic root of 1242221423 is about 1074.9782358673.

Adding to 1242221423 its reverse (3241222421), we get a palindrome (4483443844).

The spelling of 1242221423 in words is "one billion, two hundred forty-two million, two hundred twenty-one thousand, four hundred twenty-three".