1423443021 has 128 divisors (see below), whose sum is σ = 2735824896. Its totient is φ = 634106880.

The previous prime is 1423443019. The next prime is 1423443029. The reversal of 1423443021 is 1203443241.

It is not a de Polignac number, because 1423443021 - 2¹ = 1423443019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1423442982 and 1423443000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423443029) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2555275 + ... + 2555831.

It is an arithmetic number, because the mean of its divisors is an integer number (21373632).

Almost surely, 2^1423443021 is an apocalyptic number.

1423443021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1423443021 is a deficient number, since it is larger than the sum of its proper divisors (1312381875).

1423443021 is a wasteful number, since it uses less digits than its factorization.

1423443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1423443021 is about 37728.5438494517. The cubic root of 1423443021 is about 1124.8985642864.

Adding to 1423443021 its reverse (1203443241), we get a palindrome (2626886262).

It can be divided in two parts, 1423 and 443021, that added together give a palindrome (444444).

The spelling of 1423443021 in words is "one billion, four hundred twenty-three million, four hundred forty-three thousand, twenty-one".