21040414042 has 8 divisors (see below), whose sum is σ = 31561410132. Its totient is φ = 10519944000.

The previous prime is 21040413983. The next prime is 21040414069. The reversal of 21040414042 is 24041404012.

It can be written as a sum of positive squares in 2 ways, for example, as 17221050441 + 3819363601 = 131229^2 + 61801^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8509 + ... + 205312.

Almost surely, 2^21040414042 is an apocalyptic number.

21040414042 is a deficient number, since it is larger than the sum of its proper divisors (10520996090).

21040414042 is a wasteful number, since it uses less digits than its factorization.

21040414042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263024.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21040414042 its reverse (24041404012), we get a palindrome (45081818054).

The spelling of 21040414042 in words is "twenty-one billion, forty million, four hundred fourteen thousand, forty-two".