21011834 has 32 divisors (see below), whose sum is σ = 35856000. Its totient is φ = 9180864.

The previous prime is 21011807. The next prime is 21011839. The reversal of 21011834 is 43811012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21011839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24932 + ... + 25760.

It is an arithmetic number, because the mean of its divisors is an integer number (1120500).

Almost surely, 2^21011834 is an apocalyptic number.

21011834 is a deficient number, since it is larger than the sum of its proper divisors (14844166).

21011834 is a wasteful number, since it uses less digits than its factorization.

21011834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21011834 is about 4583.8667083588. The cubic root of 21011834 is about 275.9442318885.

Adding to 21011834 its reverse (43811012), we get a palindrome (64822846).

The spelling of 21011834 in words is "twenty-one million, eleven thousand, eight hundred thirty-four".