21542322 has 8 divisors (see below), whose sum is σ = 43084656. Its totient is φ = 7180772.

The previous prime is 21542321. The next prime is 21542341. The reversal of 21542322 is 22324512.

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

21542322 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21542321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1795188 + ... + 1795199.

It is an arithmetic number, because the mean of its divisors is an integer number (5385582).

Almost surely, 2^21542322 is an apocalyptic number.

21542322 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21542322 is a wasteful number, since it uses less digits than its factorization.

21542322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590392.

The product of its digits is 960, while the sum is 21.

The square root of 21542322 is about 4641.3707027127. The cubic root of 21542322 is about 278.2472224165.

Adding to 21542322 its reverse (22324512), we get a palindrome (43866834).

The spelling of 21542322 in words is "twenty-one million, five hundred forty-two thousand, three hundred twenty-two".