21212449840044 has 72 divisors (see below), whose sum is σ = 57490298643120. Its totient is φ = 6763389785856.

The previous prime is 21212449840039. The next prime is 21212449840061. The reversal of 21212449840044 is 44004894421212.

It is a happy number.

21212449840044 is a `hidden beast` number, since 2 + 121 + 2 + 449 + 8 + 40 + 0 + 44 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185587077 + ... + 185701340.

Almost surely, 2^{21212449840044} is an apocalyptic number.

It is an amenable number.

21212449840044 is an abundant number, since it is smaller than the sum of its proper divisors (36277848803076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212449840044 is a wasteful number, since it uses less digits than its factorization.

21212449840044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371288476 (or 371288445 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 45.

The spelling of 21212449840044 in words is "twenty-one trillion, two hundred twelve billion, four hundred forty-nine million, eight hundred forty thousand, forty-four".