21674157 has 8 divisors (see below), whose sum is σ = 28920384. Its totient is φ = 14438688.

The previous prime is 21674153. The next prime is 21674171. The reversal of 21674157 is 75147612.

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

It is not a de Polignac number, because 21674157 - 2² = 21674153 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6633 + ... + 9345.

It is an arithmetic number, because the mean of its divisors is an integer number (3615048).

Almost surely, 2^21674157 is an apocalyptic number.

It is an amenable number.

21674157 is a deficient number, since it is larger than the sum of its proper divisors (7246227).

21674157 is a wasteful number, since it uses less digits than its factorization.

21674157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379.

The product of its digits is 11760, while the sum is 33.

The square root of 21674157 is about 4655.5512025967. The cubic root of 21674157 is about 278.8136755202.

The spelling of 21674157 in words is "twenty-one million, six hundred seventy-four thousand, one hundred fifty-seven".