21750542 has 8 divisors (see below), whose sum is σ = 35591832. Its totient is φ = 9886600.

The previous prime is 21750529. The next prime is 21750563. The reversal of 21750542 is 24505712.

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

It is a congruent number.

It is an unprimeable number.

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, 494309 + ... + 494352.

It is an arithmetic number, because the mean of its divisors is an integer number (4448979).

Almost surely, 2^21750542 is an apocalyptic number.

21750542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21750542 is a deficient number, since it is larger than the sum of its proper divisors (13841290).

21750542 is a wasteful number, since it uses less digits than its factorization.

21750542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988674.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 21750542 is about 4663.7476346818. The cubic root of 21750542 is about 279.1408272314.

The spelling of 21750542 in words is "twenty-one million, seven hundred fifty thousand, five hundred forty-two".