21411406720 has 64 divisors (see below), whose sum is σ = 55839993840. Its totient is φ = 7785963520.

The previous prime is 21411406711. The next prime is 21411406763. The reversal of 21411406720 is 2760411412.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×21411406720³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1513657 + ... + 1527736.

Almost surely, 2^21411406720 is an apocalyptic number.

21411406720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21411406720 is an abundant number, since it is smaller than the sum of its proper divisors (34428587120).

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

21411406720 is a wasteful number, since it uses less digits than its factorization.

21411406720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3041423 (or 3041411 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The spelling of 21411406720 in words is "twenty-one billion, four hundred eleven million, four hundred six thousand, seven hundred twenty".