21394854 has 40 divisors (see below), whose sum is σ = 51633120. Its totient is φ = 6582384.

The previous prime is 21394829. The next prime is 21394889. The reversal of 21394854 is 45849312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2974 + ... + 7185.

It is an arithmetic number, because the mean of its divisors is an integer number (1290828).

Almost surely, 2^21394854 is an apocalyptic number.

21394854 is an abundant number, since it is smaller than the sum of its proper divisors (30238266).

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

21394854 is a wasteful number, since it uses less digits than its factorization.

21394854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10186 (or 10177 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 21394854 is about 4625.4571665945. The cubic root of 21394854 is about 277.6108541767.

The spelling of 21394854 in words is "twenty-one million, three hundred ninety-four thousand, eight hundred fifty-four".