21412332516 has 12 divisors (see below), whose sum is σ = 49962109232. Its totient is φ = 7137444168.

The previous prime is 21412332509. The next prime is 21412332547. The reversal of 21412332516 is 61523321412.

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

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, 892180510 + ... + 892180533.

Almost surely, 2^21412332516 is an apocalyptic number.

It is an amenable number.

21412332516 is an abundant number, since it is smaller than the sum of its proper divisors (28549776716).

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

21412332516 is a wasteful number, since it uses less digits than its factorization.

21412332516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784361050 (or 1784361048 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

Adding to 21412332516 its reverse (61523321412), we get a palindrome (82935653928).

The spelling of 21412332516 in words is "twenty-one billion, four hundred twelve million, three hundred thirty-two thousand, five hundred sixteen".