21673426 has 8 divisors (see below), whose sum is σ = 32758704. Its totient is φ = 10753860.

The previous prime is 21673423. The next prime is 21673459. The reversal of 21673426 is 62437612.

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

It is not an unprimeable number, because it can be changed into a prime (21673423) 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, 41100 + ... + 41623.

It is an arithmetic number, because the mean of its divisors is an integer number (4094838).

Almost surely, 2^21673426 is an apocalyptic number.

21673426 is a deficient number, since it is larger than the sum of its proper divisors (11085278).

21673426 is a wasteful number, since it uses less digits than its factorization.

21673426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82856.

The product of its digits is 12096, while the sum is 31.

The square root of 21673426 is about 4655.4726935081. The cubic root of 21673426 is about 278.8105409871.

The spelling of 21673426 in words is "twenty-one million, six hundred seventy-three thousand, four hundred twenty-six".