21420094 has 8 divisors (see below), whose sum is σ = 32220720. Its totient is φ = 10679856.

The previous prime is 21420079. The next prime is 21420097. The reversal of 21420094 is 49002412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420097) 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 in 3 ways as a sum of consecutive naturals, for example, 14199 + ... + 15634.

It is an arithmetic number, because the mean of its divisors is an integer number (4027590).

Almost surely, 2^21420094 is an apocalyptic number.

21420094 is a deficient number, since it is larger than the sum of its proper divisors (10800626).

21420094 is a wasteful number, since it uses less digits than its factorization.

21420094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30194.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21420094 is about 4628.1847413430. The cubic root of 21420094 is about 277.7199792396.

The spelling of 21420094 in words is "twenty-one million, four hundred twenty thousand, ninety-four".