21541541412 has 12 divisors (see below), whose sum is σ = 50263596656. Its totient is φ = 7180513800.

The previous prime is 21541541407. The next prime is 21541541429. The reversal of 21541541412 is 21414514512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21541541412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897564214 + ... + 897564237.

Almost surely, 2^21541541412 is an apocalyptic number.

It is an amenable number.

21541541412 is an abundant number, since it is smaller than the sum of its proper divisors (28722055244).

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

21541541412 is a wasteful number, since it uses less digits than its factorization.

21541541412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795128458 (or 1795128456 counting only the distinct ones).

The product of its digits is 6400, while the sum is 30.

The spelling of 21541541412 in words is "twenty-one billion, five hundred forty-one million, five hundred forty-one thousand, four hundred twelve".