21000334 has 8 divisors (see below), whose sum is σ = 32870160. Its totient is φ = 10043616.

The previous prime is 21000313. The next prime is 21000337. The reversal of 21000334 is 43300012.

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

It is a super-2 number, since 2×21000334² = 882028056223112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228219 + ... + 228310.

It is an arithmetic number, because the mean of its divisors is an integer number (4108770).

Almost surely, 2^21000334 is an apocalyptic number.

21000334 is a deficient number, since it is larger than the sum of its proper divisors (11869826).

21000334 is a wasteful number, since it uses less digits than its factorization.

21000334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456554.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21000334 is about 4582.6121371986. The cubic root of 21000334 is about 275.8938802981.

Adding to 21000334 its reverse (43300012), we get a palindrome (64300346).

The spelling of 21000334 in words is "twenty-one million, three hundred thirty-four", and thus it is an aban number.