21422346 has 64 divisors (see below), whose sum is σ = 50461056. Its totient is φ = 5990400.

The previous prime is 21422341. The next prime is 21422347. The reversal of 21422346 is 64322412.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21422341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68286 + ... + 68598.

It is an arithmetic number, because the mean of its divisors is an integer number (788454).

Almost surely, 2^21422346 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21422346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25230528).

21422346 is an abundant number, since it is smaller than the sum of its proper divisors (29038710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21422346 is a wasteful number, since it uses less digits than its factorization.

21422346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407.

The product of its digits is 2304, while the sum is 24.

The square root of 21422346 is about 4628.4280268791. The cubic root of 21422346 is about 277.7297115884.

Adding to 21422346 its reverse (64322412), we get a palindrome (85744758).

The spelling of 21422346 in words is "twenty-one million, four hundred twenty-two thousand, three hundred forty-six".