21041842 has 8 divisors (see below), whose sum is σ = 31675932. Its totient is φ = 10483200.

The previous prime is 21041827. The next prime is 21041857. The reversal of 21041842 is 24814012.

It is an interprime number because it is at equal distance from previous prime (21041827) and next prime (21041857).

It can be written as a sum of positive squares in 2 ways, for example, as 20802721 + 239121 = 4561^2 + 489^2 .

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

It is a super-2 number, since 2×21041842² = 885518229505928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18159 + ... + 19282.

Almost surely, 2^21041842 is an apocalyptic number.

21041842 is a deficient number, since it is larger than the sum of its proper divisors (10634090).

21041842 is a wasteful number, since it uses less digits than its factorization.

21041842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37724.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 21041842 is about 4587.1387596191. The cubic root of 21041842 is about 276.0755324324.

Adding to 21041842 its reverse (24814012), we get a palindrome (45855854).

The spelling of 21041842 in words is "twenty-one million, forty-one thousand, eight hundred forty-two".