21434866684 has 24 divisors (see below), whose sum is σ = 46766982528. Its totient is φ = 8351246640.

The previous prime is 21434866681. The next prime is 21434866723. The reversal of 21434866684 is 48666843412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434866681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34796554 + ... + 34797169.

It is an arithmetic number, because the mean of its divisors is an integer number (1948624272).

Almost surely, 2^21434866684 is an apocalyptic number.

It is an amenable number.

21434866684 is an abundant number, since it is smaller than the sum of its proper divisors (25332115844).

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

21434866684 is a wasteful number, since it uses less digits than its factorization.

21434866684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69593745 (or 69593743 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 52.

The spelling of 21434866684 in words is "twenty-one billion, four hundred thirty-four million, eight hundred sixty-six thousand, six hundred eighty-four".