21442094 has 4 divisors (see below), whose sum is σ = 32163144. Its totient is φ = 10721046.

The previous prime is 21442093. The next prime is 21442097. The reversal of 21442094 is 49024412.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442093) by changing a digit.

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 as a sum of consecutive naturals, namely, 5360522 + ... + 5360525.

It is an arithmetic number, because the mean of its divisors is an integer number (8040786).

Almost surely, 2^21442094 is an apocalyptic number.

21442094 is a deficient number, since it is larger than the sum of its proper divisors (10721050).

21442094 is a wasteful number, since it uses less digits than its factorization.

21442094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10721049.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21442094 is about 4630.5608731556. The cubic root of 21442094 is about 277.8150262701.

The spelling of 21442094 in words is "twenty-one million, four hundred forty-two thousand, ninety-four".