21045834 has 24 divisors (see below), whose sum is σ = 46661472. Its totient is φ = 6851880.

The previous prime is 21045811. The next prime is 21045853. The reversal of 21045834 is 43854012.

It is a junction number, because it is equal to n+sod(n) for n = 21045798 and 21045807.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12822 + ... + 14369.

It is an arithmetic number, because the mean of its divisors is an integer number (1944228).

Almost surely, 2^21045834 is an apocalyptic number.

21045834 is an abundant number, since it is smaller than the sum of its proper divisors (25615638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21045834 is a wasteful number, since it uses less digits than its factorization.

21045834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27242 (or 27239 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 21045834 is about 4587.5738686151. The cubic root of 21045834 is about 276.0929900903.

Adding to 21045834 its reverse (43854012), we get a palindrome (64899846).

The spelling of 21045834 in words is "twenty-one million, forty-five thousand, eight hundred thirty-four".