21542498 has 8 divisors (see below), whose sum is σ = 32546640. Its totient is φ = 10693620.

The previous prime is 21542483. The next prime is 21542537. The reversal of 21542498 is 89424512.

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

It is a Curzon number.

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, 38468 + ... + 39023.

It is an arithmetic number, because the mean of its divisors is an integer number (4068330).

Almost surely, 2^21542498 is an apocalyptic number.

21542498 is a deficient number, since it is larger than the sum of its proper divisors (11004142).

21542498 is a wasteful number, since it uses less digits than its factorization.

21542498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77632.

The product of its digits is 23040, while the sum is 35.

The square root of 21542498 is about 4641.3896625903. The cubic root of 21542498 is about 278.2479801710.

The spelling of 21542498 in words is "twenty-one million, five hundred forty-two thousand, four hundred ninety-eight".