21034263 has 8 divisors (see below), whose sum is σ = 28072576. Its totient is φ = 14009400.

The previous prime is 21034261. The next prime is 21034297. The reversal of 21034263 is 36243012.

It is a happy number.

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

It is not a de Polignac number, because 21034263 - 2¹ = 21034261 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 (21034261) 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, 1158 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (3509072).

Almost surely, 2^21034263 is an apocalyptic number.

21034263 is a deficient number, since it is larger than the sum of its proper divisors (7038313).

21034263 is a wasteful number, since it uses less digits than its factorization.

21034263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6725.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 21034263 is about 4586.3125711185. The cubic root of 21034263 is about 276.0423821704.

Adding to 21034263 its reverse (36243012), we get a palindrome (57277275).

The spelling of 21034263 in words is "twenty-one million, thirty-four thousand, two hundred sixty-three".