21466127840 has 96 divisors (see below), whose sum is σ = 51742787040. Its totient is φ = 8412678144.

The previous prime is 21466127797. The next prime is 21466127843. The reversal of 21466127840 is 4872166412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21466127843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8453291 + ... + 8455829.

It is an arithmetic number, because the mean of its divisors is an integer number (538987365).

Almost surely, 2^21466127840 is an apocalyptic number.

21466127840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21466127840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25871393520).

21466127840 is an abundant number, since it is smaller than the sum of its proper divisors (30276659200).

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

21466127840 is a wasteful number, since it uses less digits than its factorization.

21466127840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604 (or 3596 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 21466127840 in words is "twenty-one billion, four hundred sixty-six million, one hundred twenty-seven thousand, eight hundred forty".