21141242 has 4 divisors (see below), whose sum is σ = 31711866. Its totient is φ = 10570620.

The previous prime is 21141233. The next prime is 21141257. The reversal of 21141242 is 24214112.

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

It can be written as a sum of positive squares in only one way, i.e., 13845841 + 7295401 = 3721^2 + 2701^2 .

It is a super-2 number, since 2×21141242² = 893904226605128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21141242.

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 as a sum of consecutive naturals, namely, 5285309 + ... + 5285312.

Almost surely, 2^21141242 is an apocalyptic number.

21141242 is a deficient number, since it is larger than the sum of its proper divisors (10570624).

21141242 is a wasteful number, since it uses less digits than its factorization.

21141242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570623.

The product of its digits is 128, while the sum is 17.

The square root of 21141242 is about 4597.9606348902. The cubic root of 21141242 is about 276.5095693675.

Adding to 21141242 its reverse (24214112), we get a palindrome (45355354).

The spelling of 21141242 in words is "twenty-one million, one hundred forty-one thousand, two hundred forty-two".