21674049 has 8 divisors (see below), whose sum is σ = 29895360. Its totient is φ = 13951056.

The previous prime is 21674047. The next prime is 21674057. The reversal of 21674049 is 94047612.

It is a happy number.

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

It is not a de Polignac number, because 21674049 - 2¹ = 21674047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21674047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124477 + ... + 124650.

It is an arithmetic number, because the mean of its divisors is an integer number (3736920).

Almost surely, 2^21674049 is an apocalyptic number.

21674049 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21674049 is a deficient number, since it is larger than the sum of its proper divisors (8221311).

21674049 is a wasteful number, since it uses less digits than its factorization.

21674049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249159.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 21674049 is about 4655.5396035261. The cubic root of 21674049 is about 278.8132124199.

It can be divided in two parts, 2167 and 4049, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 21674049 in words is "twenty-one million, six hundred seventy-four thousand, forty-nine".