21196723 has 8 divisors (see below), whose sum is σ = 22646720. Its totient is φ = 19780200.

The previous prime is 21196711. The next prime is 21196733. The reversal of 21196723 is 32769112.

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

It is a cyclic number.

It is not a de Polignac number, because 21196723 - 2⁵ = 21196691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21196733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7053 + ... + 9598.

It is an arithmetic number, because the mean of its divisors is an integer number (2830840).

Almost surely, 2^21196723 is an apocalyptic number.

21196723 is a deficient number, since it is larger than the sum of its proper divisors (1449997).

21196723 is a wasteful number, since it uses less digits than its factorization.

21196723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16737.

The product of its digits is 4536, while the sum is 31.

The square root of 21196723 is about 4603.9899000758. The cubic root of 21196723 is about 276.7512396081.

The spelling of 21196723 in words is "twenty-one million, one hundred ninety-six thousand, seven hundred twenty-three".