21672342 has 12 divisors (see below), whose sum is σ = 46956780. Its totient is φ = 7224108.

The previous prime is 21672341. The next prime is 21672347. The reversal of 21672342 is 24327612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21672341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 601992 + ... + 602027.

It is an arithmetic number, because the mean of its divisors is an integer number (3913065).

Almost surely, 2^21672342 is an apocalyptic number.

21672342 is an abundant number, since it is smaller than the sum of its proper divisors (25284438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21672342 is a wasteful number, since it uses less digits than its factorization.

21672342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204027 (or 1204024 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 21672342 is about 4655.3562699325. The cubic root of 21672342 is about 278.8058926577.

Adding to 21672342 its reverse (24327612), we get a palindrome (45999954).

The spelling of 21672342 in words is "twenty-one million, six hundred seventy-two thousand, three hundred forty-two".