21365834 has 16 divisors (see below), whose sum is σ = 36816000. Its totient is φ = 9109584.

The previous prime is 21365819. The next prime is 21365849. The reversal of 21365834 is 43856312.

It is an interprime number because it is at equal distance from previous prime (21365819) and next prime (21365849).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21365834.

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, 1049 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (2301000).

Almost surely, 2^21365834 is an apocalyptic number.

21365834 is a deficient number, since it is larger than the sum of its proper divisors (15450166).

21365834 is a wasteful number, since it uses less digits than its factorization.

21365834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7877.

The product of its digits is 17280, while the sum is 32.

The square root of 21365834 is about 4622.3191149033. The cubic root of 21365834 is about 277.4852801758.

The spelling of 21365834 in words is "twenty-one million, three hundred sixty-five thousand, eight hundred thirty-four".