21552834 has 16 divisors (see below), whose sum is σ = 43392960. Its totient is φ = 7136400.

The previous prime is 21552823. The next prime is 21552841. The reversal of 21552834 is 43825512.

It is a Curzon number.

It is a zygodrome in base 9.

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, 10989 + ... + 12800.

It is an arithmetic number, because the mean of its divisors is an integer number (2712060).

Almost surely, 2^21552834 is an apocalyptic number.

21552834 is an abundant number, since it is smaller than the sum of its proper divisors (21840126).

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

21552834 is a wasteful number, since it uses less digits than its factorization.

21552834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23945.

The product of its digits is 9600, while the sum is 30.

The square root of 21552834 is about 4642.5029886905. The cubic root of 21552834 is about 278.2924737930.

The spelling of 21552834 in words is "twenty-one million, five hundred fifty-two thousand, eight hundred thirty-four".