21323038 has 16 divisors (see below), whose sum is σ = 35466480. Its totient is φ = 9532800.

The previous prime is 21323021. The next prime is 21323053. The reversal of 21323038 is 83032312.

It is a happy number.

It is a super-3 number, since 3×21323038³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6603 + ... + 9286.

It is an arithmetic number, because the mean of its divisors is an integer number (2216655).

Almost surely, 2^21323038 is an apocalyptic number.

21323038 is a deficient number, since it is larger than the sum of its proper divisors (14143442).

21323038 is a wasteful number, since it uses less digits than its factorization.

21323038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15963.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21323038 is about 4617.6875164957. The cubic root of 21323038 is about 277.2998876524.

It can be divided in two parts, 213 and 23038, that multiplied together give a palindrome (4907094).

The spelling of 21323038 in words is "twenty-one million, three hundred twenty-three thousand, thirty-eight".