21949323 has 8 divisors (see below), whose sum is σ = 31926336. Its totient is φ = 13302600.

The previous prime is 21949303. The next prime is 21949331. The reversal of 21949323 is 32394912.

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

It is not a de Polignac number, because 21949323 - 2⁹ = 21948811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 665131 = 21949323 / (2 + 1 + 9 + 4 + 9 + 3 + 2 + 3).

It is not an unprimeable number, because it can be changed into a prime (21949303) 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, 332533 + ... + 332598.

It is an arithmetic number, because the mean of its divisors is an integer number (3990792).

Almost surely, 2^21949323 is an apocalyptic number.

21949323 is a deficient number, since it is larger than the sum of its proper divisors (9977013).

21949323 is a wasteful number, since it uses less digits than its factorization.

21949323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665145.

The product of its digits is 11664, while the sum is 33.

The square root of 21949323 is about 4685.0104588997. The cubic root of 21949323 is about 279.9886177346.

It can be divided in two parts, 2 and 1949323, that added together give a triangular number (1949325 = T₁₉₇₄).

The spelling of 21949323 in words is "twenty-one million, nine hundred forty-nine thousand, three hundred twenty-three".