21672134 has 8 divisors (see below), whose sum is σ = 35463528. Its totient is φ = 9850960.

The previous prime is 21672109. The next prime is 21672137. The reversal of 21672134 is 43127612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21672134² = 939362784227912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21672137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492527 + ... + 492570.

It is an arithmetic number, because the mean of its divisors is an integer number (4432941).

Almost surely, 2^21672134 is an apocalyptic number.

21672134 is a deficient number, since it is larger than the sum of its proper divisors (13791394).

21672134 is a wasteful number, since it uses less digits than its factorization.

21672134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985110.

The product of its digits is 2016, while the sum is 26.

The square root of 21672134 is about 4655.3339300205. Note that the first 3 decimals coincide. The cubic root of 21672134 is about 278.8050007097.

Adding to 21672134 its reverse (43127612), we get a palindrome (64799746).

The spelling of 21672134 in words is "twenty-one million, six hundred seventy-two thousand, one hundred thirty-four".