21149323 has 8 divisors (see below), whose sum is σ = 23562000. Its totient is φ = 18848928.

The previous prime is 21149321. The next prime is 21149333. The reversal of 21149323 is 32394112.

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 21149323 - 2¹ = 21149321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21149321) 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, 27673 + ... + 28426.

It is an arithmetic number, because the mean of its divisors is an integer number (2945250).

Almost surely, 2^21149323 is an apocalyptic number.

21149323 is a deficient number, since it is larger than the sum of its proper divisors (2412677).

21149323 is a wasteful number, since it uses less digits than its factorization.

21149323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56141.

The product of its digits is 1296, while the sum is 25.

The square root of 21149323 is about 4598.8393100868. The cubic root of 21149323 is about 276.5447957620.

The spelling of 21149323 in words is "twenty-one million, one hundred forty-nine thousand, three hundred twenty-three".