21402322 has 8 divisors (see below), whose sum is σ = 33793200. Its totient is φ = 10137924.

The previous prime is 21402299. The next prime is 21402323. The reversal of 21402322 is 22320412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21402296 and 21402305.

It is not an unprimeable number, because it can be changed into a prime (21402323) 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 3 ways as a sum of consecutive naturals, for example, 281572 + ... + 281647.

It is an arithmetic number, because the mean of its divisors is an integer number (4224150).

Almost surely, 2^21402322 is an apocalyptic number.

21402322 is a deficient number, since it is larger than the sum of its proper divisors (12390878).

21402322 is a wasteful number, since it uses less digits than its factorization.

21402322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563240.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21402322 is about 4626.2643677161. The cubic root of 21402322 is about 277.6431509880.

Adding to 21402322 its reverse (22320412), we get a palindrome (43722734).

The spelling of 21402322 in words is "twenty-one million, four hundred two thousand, three hundred twenty-two".