21673734 has 8 divisors (see below), whose sum is σ = 43347480. Its totient is φ = 7224576.

The previous prime is 21673711. The next prime is 21673741. The reversal of 21673734 is 43737612.

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

21673734 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21673695 and 21673704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806139 + ... + 1806150.

It is an arithmetic number, because the mean of its divisors is an integer number (5418435).

Almost surely, 2^21673734 is an apocalyptic number.

21673734 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21673734 is a wasteful number, since it uses less digits than its factorization.

21673734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612294.

The product of its digits is 21168, while the sum is 33.

The square root of 21673734 is about 4655.5057727383. The cubic root of 21673734 is about 278.8118617018.

The spelling of 21673734 in words is "twenty-one million, six hundred seventy-three thousand, seven hundred thirty-four".