21526834 has 32 divisors (see below), whose sum is σ = 38439936. Its totient is φ = 8847360.

The previous prime is 21526831. The next prime is 21526847. The reversal of 21526834 is 43862512.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 21526796 and 21526805.

It is not an unprimeable number, because it can be changed into a prime (21526831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83634 + ... + 83890.

It is an arithmetic number, because the mean of its divisors is an integer number (1201248).

Almost surely, 2^21526834 is an apocalyptic number.

21526834 is a deficient number, since it is larger than the sum of its proper divisors (16913102).

21526834 is a wasteful number, since it uses less digits than its factorization.

21526834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490.

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

The square root of 21526834 is about 4639.7019300813. The cubic root of 21526834 is about 278.1805238471.

The spelling of 21526834 in words is "twenty-one million, five hundred twenty-six thousand, eight hundred thirty-four".