1421257423 has 12 divisors (see below), whose sum is σ = 1488043368. Its totient is φ = 1357355120.

The previous prime is 1421257373. The next prime is 1421257427. The reversal of 1421257423 is 3247521241.

It is a happy number.

It is not a de Polignac number, because 1421257423 - 2²⁵ = 1387702991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421257427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 419928 + ... + 423298.

It is an arithmetic number, because the mean of its divisors is an integer number (124003614).

Almost surely, 2^1421257423 is an apocalyptic number.

1421257423 is a deficient number, since it is larger than the sum of its proper divisors (66785945).

1421257423 is an equidigital number, since it uses as much as digits as its factorization.

1421257423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214 (or 4191 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The square root of 1421257423 is about 37699.5679418213. The cubic root of 1421257423 is about 1124.3225348014.

Adding to 1421257423 its reverse (3247521241), we get a palindrome (4668778664).

The spelling of 1421257423 in words is "one billion, four hundred twenty-one million, two hundred fifty-seven thousand, four hundred twenty-three".