21268435 has 8 divisors (see below), whose sum is σ = 25549776. Its totient is φ = 16996320.

The previous prime is 21268427. The next prime is 21268441. The reversal of 21268435 is 53486212.

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

It is not a de Polignac number, because 21268435 - 2³ = 21268427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21268397 and 21268406.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4720 + ... + 8050.

It is an arithmetic number, because the mean of its divisors is an integer number (3193722).

Almost surely, 2^21268435 is an apocalyptic number.

21268435 is a deficient number, since it is larger than the sum of its proper divisors (4281341).

21268435 is a wasteful number, since it uses less digits than its factorization.

21268435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4613.

The product of its digits is 11520, while the sum is 31.

The square root of 21268435 is about 4611.7713516609. The cubic root of 21268435 is about 277.0629866279.

The spelling of 21268435 in words is "twenty-one million, two hundred sixty-eight thousand, four hundred thirty-five".