21050542 has 8 divisors (see below), whose sum is σ = 31603896. Its totient is φ = 10515912.

The previous prime is 21050527. The next prime is 21050567. The reversal of 21050542 is 24505012.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1413 + ... + 6640.

It is an arithmetic number, because the mean of its divisors is an integer number (3950487).

Almost surely, 2^21050542 is an apocalyptic number.

21050542 is a deficient number, since it is larger than the sum of its proper divisors (10553354).

21050542 is a wasteful number, since it uses less digits than its factorization.

21050542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9362.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 21050542 is about 4588.0869651740. The cubic root of 21050542 is about 276.1135760945.

Adding to 21050542 its reverse (24505012), we get a palindrome (45555554).

The spelling of 21050542 in words is "twenty-one million, fifty thousand, five hundred forty-two".