21462347 has 4 divisors (see below), whose sum is σ = 22724856. Its totient is φ = 20199840.

The previous prime is 21462319. The next prime is 21462359. The reversal of 21462347 is 74326412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21462347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21462307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631229 + ... + 631262.

It is an arithmetic number, because the mean of its divisors is an integer number (5681214).

Almost surely, 2^21462347 is an apocalyptic number.

21462347 is a deficient number, since it is larger than the sum of its proper divisors (1262509).

21462347 is a wasteful number, since it uses less digits than its factorization.

21462347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262508.

The product of its digits is 8064, while the sum is 29.

The square root of 21462347 is about 4632.7472411087. The cubic root of 21462347 is about 277.9024682450.

Adding to 21462347 its reverse (74326412), we get a palindrome (95788759).

The spelling of 21462347 in words is "twenty-one million, four hundred sixty-two thousand, three hundred forty-seven".