21159854 has 16 divisors (see below), whose sum is σ = 32916240. Its totient is φ = 10194240.

The previous prime is 21159811. The next prime is 21159857. The reversal of 21159854 is 45895112.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21159857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5252 + ... + 8360.

It is an arithmetic number, because the mean of its divisors is an integer number (2057265).

Almost surely, 2^21159854 is an apocalyptic number.

21159854 is a deficient number, since it is larger than the sum of its proper divisors (11756386).

21159854 is a wasteful number, since it uses less digits than its factorization.

21159854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235.

The product of its digits is 14400, while the sum is 35.

The square root of 21159854 is about 4599.9841304074. The cubic root of 21159854 is about 276.5906886416.

The spelling of 21159854 in words is "twenty-one million, one hundred fifty-nine thousand, eight hundred fifty-four".