21235542 has 8 divisors (see below), whose sum is σ = 42471096. Its totient is φ = 7078512.

The previous prime is 21235537. The next prime is 21235549. The reversal of 21235542 is 24553212.

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

21235542 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235549) 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, 1769623 + ... + 1769634.

It is an arithmetic number, because the mean of its divisors is an integer number (5308887).

Almost surely, 2^21235542 is an apocalyptic number.

21235542 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.

21235542 is a wasteful number, since it uses less digits than its factorization.

21235542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539262.

The product of its digits is 2400, while the sum is 24.

The square root of 21235542 is about 4608.2037715362. The cubic root of 21235542 is about 276.9200810336.

Adding to 21235542 its reverse (24553212), we get a palindrome (45788754).

The spelling of 21235542 in words is "twenty-one million, two hundred thirty-five thousand, five hundred forty-two".