21042062 has 4 divisors (see below), whose sum is σ = 31563096. Its totient is φ = 10521030.

The previous prime is 21042059. The next prime is 21042089. The reversal of 21042062 is 26024012.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21042062.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260514 + ... + 5260517.

It is an arithmetic number, because the mean of its divisors is an integer number (7890774).

Almost surely, 2^21042062 is an apocalyptic number.

21042062 is a deficient number, since it is larger than the sum of its proper divisors (10521034).

21042062 is a wasteful number, since it uses less digits than its factorization.

21042062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10521033.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21042062 is about 4587.1627396464. The cubic root of 21042062 is about 276.0764945852.

Adding to 21042062 its reverse (26024012), we get a palindrome (47066074).

The spelling of 21042062 in words is "twenty-one million, forty-two thousand, sixty-two".