21672074 has 8 divisors (see below), whose sum is σ = 32571840. Its totient is φ = 10814796.

The previous prime is 21672073. The next prime is 21672089. The reversal of 21672074 is 47027612.

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

It is a super-2 number, since 2×21672074² = 939357582922952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21672073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9314 + ... + 11405.

It is an arithmetic number, because the mean of its divisors is an integer number (4071480).

Almost surely, 2^21672074 is an apocalyptic number.

21672074 is a deficient number, since it is larger than the sum of its proper divisors (10899766).

21672074 is a wasteful number, since it uses less digits than its factorization.

21672074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21244.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 21672074 is about 4655.3274857952. The cubic root of 21672074 is about 278.8047434159.

Adding to 21672074 its reverse (47027612), we get a palindrome (68699686).

The spelling of 21672074 in words is "twenty-one million, six hundred seventy-two thousand, seventy-four".