21434847 has 8 divisors (see below), whose sum is σ = 32662656. Its totient is φ = 12248472.

The previous prime is 21434839. The next prime is 21434879. The reversal of 21434847 is 74843412.

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

It is not a de Polignac number, because 21434847 - 2³ = 21434839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434837) 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, 510333 + ... + 510374.

It is an arithmetic number, because the mean of its divisors is an integer number (4082832).

Almost surely, 2^21434847 is an apocalyptic number.

21434847 is a deficient number, since it is larger than the sum of its proper divisors (11227809).

21434847 is a wasteful number, since it uses less digits than its factorization.

21434847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020717.

The product of its digits is 21504, while the sum is 33.

The square root of 21434847 is about 4629.7782884281. The cubic root of 21434847 is about 277.7837240979.

The spelling of 21434847 in words is "twenty-one million, four hundred thirty-four thousand, eight hundred forty-seven".