1221002423 has 2 divisors, whose sum is σ = 1221002424. Its totient is φ = 1221002422.

The previous prime is 1221002417. The next prime is 1221002437. The reversal of 1221002423 is 3242001221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221002423 - 2¹⁰ = 1221001399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221002443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610501211 + 610501212.

It is an arithmetic number, because the mean of its divisors is an integer number (610501212).

Almost surely, 2^1221002423 is an apocalyptic number.

1221002423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221002423 is an equidigital number, since it uses as much as digits as its factorization.

1221002423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1221002423 is about 34942.8450902327. The cubic root of 1221002423 is about 1068.8223054349.

Adding to 1221002423 its reverse (3242001221), we get a palindrome (4463003644).

The spelling of 1221002423 in words is "one billion, two hundred twenty-one million, two thousand, four hundred twenty-three".