21169323 has 24 divisors (see below), whose sum is σ = 36484560. Its totient is φ = 12096000.

The previous prime is 21169321. The next prime is 21169331. The reversal of 21169323 is 32396112.

It is not a de Polignac number, because 21169323 - 2¹ = 21169321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21169321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6678 + ... + 9323.

It is an arithmetic number, because the mean of its divisors is an integer number (1520190).

Almost surely, 2^21169323 is an apocalyptic number.

21169323 is a deficient number, since it is larger than the sum of its proper divisors (15315237).

21169323 is a wasteful number, since it uses less digits than its factorization.

21169323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16024 (or 16011 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 21169323 is about 4601.0132579683. The cubic root of 21169323 is about 276.6319404488.

The spelling of 21169323 in words is "twenty-one million, one hundred sixty-nine thousand, three hundred twenty-three".