21265834 has 8 divisors (see below), whose sum is σ = 31963680. Its totient is φ = 10611276.

The previous prime is 21265831. The next prime is 21265837. The reversal of 21265834 is 43856212.

It is an interprime number because it is at equal distance from previous prime (21265831) and next prime (21265837).

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

It is a junction number, because it is equal to n+sod(n) for n = 21265796 and 21265805.

It is not an unprimeable number, because it can be changed into a prime (21265831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9564 + ... + 11575.

It is an arithmetic number, because the mean of its divisors is an integer number (3995460).

Almost surely, 2^21265834 is an apocalyptic number.

21265834 is a deficient number, since it is larger than the sum of its proper divisors (10697846).

21265834 is a wasteful number, since it uses less digits than its factorization.

21265834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21644.

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

The square root of 21265834 is about 4611.4893472717. The cubic root of 21265834 is about 277.0516917958.

The spelling of 21265834 in words is "twenty-one million, two hundred sixty-five thousand, eight hundred thirty-four".