21542362 has 8 divisors (see below), whose sum is σ = 33186996. Its totient is φ = 10480032.

The previous prime is 21542357. The next prime is 21542363. The reversal of 21542362 is 26324512.

It can be written as a sum of positive squares in 2 ways, for example, as 21538881 + 3481 = 4641^2 + 59^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21542363) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 145483 + ... + 145630.

Almost surely, 2^21542362 is an apocalyptic number.

21542362 is a deficient number, since it is larger than the sum of its proper divisors (11644634).

21542362 is a wasteful number, since it uses less digits than its factorization.

21542362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291152.

The product of its digits is 2880, while the sum is 25.

The square root of 21542362 is about 4641.3750117826. The cubic root of 21542362 is about 278.2473946338.

Adding to 21542362 its reverse (26324512), we get a palindrome (47866874).

It can be divided in two parts, 21542 and 362, that added together give a square (21904 = 148²).

The spelling of 21542362 in words is "twenty-one million, five hundred forty-two thousand, three hundred sixty-two".