21467047 has 12 divisors (see below), whose sum is σ = 25834680. Its totient is φ = 17764656.

The previous prime is 21467029. The next prime is 21467071. The reversal of 21467047 is 74076412.

It is not a de Polignac number, because 21467047 - 2¹⁵ = 21434279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21467077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6133 + ... + 8974.

It is an arithmetic number, because the mean of its divisors is an integer number (2152890).

Almost surely, 2^21467047 is an apocalyptic number.

21467047 is a deficient number, since it is larger than the sum of its proper divisors (4367633).

21467047 is a wasteful number, since it uses less digits than its factorization.

21467047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15150 (or 15143 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 21467047 is about 4633.2544717509. The cubic root of 21467047 is about 277.9227525484.

The spelling of 21467047 in words is "twenty-one million, four hundred sixty-seven thousand, forty-seven".