21050742 has 8 divisors (see below), whose sum is σ = 42101496. Its totient is φ = 7016912.

The previous prime is 21050741. The next prime is 21050747. The reversal of 21050742 is 24705012.

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

21050742 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050741) 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, 1754223 + ... + 1754234.

It is an arithmetic number, because the mean of its divisors is an integer number (5262687).

Almost surely, 2^21050742 is an apocalyptic number.

21050742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21050742 is a wasteful number, since it uses less digits than its factorization.

21050742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508462.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 21050742 is about 4588.1087606987. The cubic root of 21050742 is about 276.1144505382.

Adding to 21050742 its reverse (24705012), we get a palindrome (45755754).

The spelling of 21050742 in words is "twenty-one million, fifty thousand, seven hundred forty-two".