21286094 has 4 divisors (see below), whose sum is σ = 31929144. Its totient is φ = 10643046.

The previous prime is 21286081. The next prime is 21286103. The reversal of 21286094 is 49068212.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21286094.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5321522 + ... + 5321525.

It is an arithmetic number, because the mean of its divisors is an integer number (7982286).

Almost surely, 2^21286094 is an apocalyptic number.

21286094 is a deficient number, since it is larger than the sum of its proper divisors (10643050).

21286094 is a wasteful number, since it uses less digits than its factorization.

21286094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10643049.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 21286094 is about 4613.6855116057. The cubic root of 21286094 is about 277.1396464259.

The spelling of 21286094 in words is "twenty-one million, two hundred eighty-six thousand, ninety-four".