21474047 has 8 divisors (see below), whose sum is σ = 25833600. Its totient is φ = 17437464.

The previous prime is 21474031. The next prime is 21474059. The reversal of 21474047 is 74047412.

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

It is a cyclic number.

It is not a de Polignac number, because 21474047 - 2⁴ = 21474031 is a prime.

It is a super-2 number, since 2×21474047² = 922269389116418, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21474067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80597 + ... + 80862.

It is an arithmetic number, because the mean of its divisors is an integer number (3229200).

Almost surely, 2^21474047 is an apocalyptic number.

21474047 is a deficient number, since it is larger than the sum of its proper divisors (4359553).

21474047 is a wasteful number, since it uses less digits than its factorization.

21474047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161485.

The product of its (nonzero) digits is 6272, while the sum is 29.

The square root of 21474047 is about 4634.0098187207. The cubic root of 21474047 is about 277.9529577251.

The spelling of 21474047 in words is "twenty-one million, four hundred seventy-four thousand, forty-seven".