21126684480 has 112 divisors (see below), whose sum is σ = 73175189184. Its totient is φ = 5121617920.

The previous prime is 21126684457. The next prime is 21126684529. The reversal of 21126684480 is 8448662112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 989757 + ... + 1010876.

Almost surely, 2^21126684480 is an apocalyptic number.

21126684480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21126684480 is an abundant number, since it is smaller than the sum of its proper divisors (52048504704).

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

21126684480 is a wasteful number, since it uses less digits than its factorization.

21126684480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000664 (or 2000654 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The spelling of 21126684480 in words is "twenty-one billion, one hundred twenty-six million, six hundred eighty-four thousand, four hundred eighty".