21010323 has 8 divisors (see below), whose sum is σ = 28291536. Its totient is φ = 13868000.

The previous prime is 21010321. The next prime is 21010337. The reversal of 21010323 is 32301012.

It is a happy number.

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 21010323 - 2¹ = 21010321 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21010299 and 21010308.

It is not an unprimeable number, because it can be changed into a prime (21010321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34368 + ... + 34973.

It is an arithmetic number, because the mean of its divisors is an integer number (3536442).

Almost surely, 2^21010323 is an apocalyptic number.

21010323 is a deficient number, since it is larger than the sum of its proper divisors (7281213).

21010323 is a wasteful number, since it uses less digits than its factorization.

21010323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69445.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21010323 is about 4583.7018882122. The cubic root of 21010323 is about 275.9376171759.

Adding to 21010323 its reverse (32301012), we get a palindrome (53311335).

The spelling of 21010323 in words is "twenty-one million, ten thousand, three hundred twenty-three".