21263347 has 8 divisors (see below), whose sum is σ = 24407136. Its totient is φ = 18146112.

The previous prime is 21263309. The next prime is 21263353. The reversal of 21263347 is 74336212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21263347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21263357) 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, 4888 + ... + 8149.

It is an arithmetic number, because the mean of its divisors is an integer number (3050892).

Almost surely, 2^21263347 is an apocalyptic number.

21263347 is a deficient number, since it is larger than the sum of its proper divisors (3143789).

21263347 is a wasteful number, since it uses less digits than its factorization.

21263347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13277.

The product of its digits is 6048, while the sum is 28.

The square root of 21263347 is about 4611.2196868074. The cubic root of 21263347 is about 277.0408911469.

Adding to 21263347 its reverse (74336212), we get a palindrome (95599559).

The spelling of 21263347 in words is "twenty-one million, two hundred sixty-three thousand, three hundred forty-seven".