21542476 has 12 divisors (see below), whose sum is σ = 38999520. Its totient is φ = 10399760.

The previous prime is 21542459. The next prime is 21542483. The reversal of 21542476 is 67424512.

It is an unprimeable number.

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, 92740 + ... + 92971.

It is an arithmetic number, because the mean of its divisors is an integer number (3249960).

Almost surely, 2^21542476 is an apocalyptic number.

It is an amenable number.

21542476 is a deficient number, since it is larger than the sum of its proper divisors (17457044).

21542476 is a wasteful number, since it uses less digits than its factorization.

21542476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185744 (or 185742 counting only the distinct ones).

The product of its digits is 13440, while the sum is 31.

The square root of 21542476 is about 4641.3872926098. The cubic root of 21542476 is about 278.2478854520.

Adding to 21542476 its reverse (67424512), we get a palindrome (88966988).

The spelling of 21542476 in words is "twenty-one million, five hundred forty-two thousand, four hundred seventy-six".