1642233421 has 4 divisors (see below), whose sum is σ = 1643968512. Its totient is φ = 1640498332.

The previous prime is 1642233409. The next prime is 1642233469. The reversal of 1642233421 is 1243322461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1243322461 = 79 ⋅15738259.

It is a cyclic number.

It is not a de Polignac number, because 1642233421 - 2⁵ = 1642233389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1642233421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642233221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 866125 + ... + 868018.

It is an arithmetic number, because the mean of its divisors is an integer number (410992128).

Almost surely, 2^1642233421 is an apocalyptic number.

It is an amenable number.

1642233421 is a deficient number, since it is larger than the sum of its proper divisors (1735091).

1642233421 is an equidigital number, since it uses as much as digits as its factorization.

1642233421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735090.

The product of its digits is 6912, while the sum is 28.

The square root of 1642233421 is about 40524.4792810469. The cubic root of 1642233421 is about 1179.8087933507.

Adding to 1642233421 its reverse (1243322461), we get a palindrome (2885555882).

The spelling of 1642233421 in words is "one billion, six hundred forty-two million, two hundred thirty-three thousand, four hundred twenty-one".