21216041156242 has 8 divisors (see below), whose sum is σ = 31824913463100. Its totient is φ = 10607736668544.

The previous prime is 21216041156221. The next prime is 21216041156243. The reversal of 21216041156242 is 24265114061212.

It can be written as a sum of positive squares in 2 ways, for example, as 20502521376841 + 713519779401 = 4527971^2 + 844701^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21216041156243) 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, 141861367 + ... + 142010842.

Almost surely, 2^{21216041156242} is an apocalyptic number.

21216041156242 is a deficient number, since it is larger than the sum of its proper divisors (10608872306858).

21216041156242 is a wasteful number, since it uses less digits than its factorization.

21216041156242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283909580.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 21216041156242 in words is "twenty-one trillion, two hundred sixteen billion, forty-one million, one hundred fifty-six thousand, two hundred forty-two".