21411431216 has 60 divisors (see below), whose sum is σ = 50355852912. Its totient is φ = 8777349504.

The previous prime is 21411431213. The next prime is 21411431297. The reversal of 21411431216 is 61213411412.

It is not an unprimeable number, because it can be changed into a prime (21411431213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 575675 + ... + 611738.

Almost surely, 2^21411431216 is an apocalyptic number.

It is an amenable number.

21411431216 is an abundant number, since it is smaller than the sum of its proper divisors (28944421696).

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

21411431216 is a wasteful number, since it uses less digits than its factorization.

21411431216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187458 (or 1187445 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

Adding to 21411431216 its reverse (61213411412), we get a palindrome (82624842628).

The spelling of 21411431216 in words is "twenty-one billion, four hundred eleven million, four hundred thirty-one thousand, two hundred sixteen".