21795894 has 12 divisors (see below), whose sum is σ = 47224476. Its totient is φ = 7265292.

The previous prime is 21795857. The next prime is 21795899. The reversal of 21795894 is 49859712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21795899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 605424 + ... + 605459.

It is an arithmetic number, because the mean of its divisors is an integer number (3935373).

Almost surely, 2^21795894 is an apocalyptic number.

21795894 is an abundant number, since it is smaller than the sum of its proper divisors (25428582).

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

21795894 is a wasteful number, since it uses less digits than its factorization.

21795894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210891 (or 1210888 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 21795894 is about 4668.6072869754. The cubic root of 21795894 is about 279.3347044866.

The spelling of 21795894 in words is "twenty-one million, seven hundred ninety-five thousand, eight hundred ninety-four".