1221122423 has 4 divisors (see below), whose sum is σ = 1221965448. Its totient is φ = 1220279400.

The previous prime is 1221122389. The next prime is 1221122447. The reversal of 1221122423 is 3242211221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3242211221 = 367 ⋅8834363.

It is a cyclic number.

It is not a de Polignac number, because 1221122423 - 2⁸ = 1221122167 is a prime.

It is a super-2 number, since 2×1221122423² = 2982279943906781858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221122395 and 1221122404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221152423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419336 + ... + 422237.

It is an arithmetic number, because the mean of its divisors is an integer number (305491362).

Almost surely, 2^1221122423 is an apocalyptic number.

1221122423 is a deficient number, since it is larger than the sum of its proper divisors (843025).

1221122423 is an equidigital number, since it uses as much as digits as its factorization.

1221122423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843024.

The product of its digits is 384, while the sum is 20.

The square root of 1221122423 is about 34944.5621377633. The cubic root of 1221122423 is about 1068.8573188722.

Adding to 1221122423 its reverse (3242211221), we get a palindrome (4463333644).

The spelling of 1221122423 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand, four hundred twenty-three".