21041542 has 8 divisors (see below), whose sum is σ = 31789800. Its totient is φ = 10444944.

The previous prime is 21041539. The next prime is 21041543. The reversal of 21041542 is 24514012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37567 + ... + 38122.

It is an arithmetic number, because the mean of its divisors is an integer number (3973725).

Almost surely, 2^21041542 is an apocalyptic number.

21041542 is a deficient number, since it is larger than the sum of its proper divisors (10748258).

21041542 is a wasteful number, since it uses less digits than its factorization.

21041542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75830.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21041542 is about 4587.1060593799. The cubic root of 21041542 is about 276.0742203949.

Adding to 21041542 its reverse (24514012), we get a palindrome (45555554).

The spelling of 21041542 in words is "twenty-one million, forty-one thousand, five hundred forty-two".