21669411760 has 40 divisors (see below), whose sum is σ = 53344996416. Its totient is φ = 8157895680.

The previous prime is 21669411737. The next prime is 21669411779. The reversal of 21669411760 is 6711496612.

It is a tau number, because it is divible by the number of its divisors (40).

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, 7965336 + ... + 7968055.

Almost surely, 2^21669411760 is an apocalyptic number.

21669411760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21669411760 is an abundant number, since it is smaller than the sum of its proper divisors (31675584656).

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

21669411760 is a wasteful number, since it uses less digits than its factorization.

21669411760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15933421 (or 15933415 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 21669411760 in words is "twenty-one billion, six hundred sixty-nine million, four hundred eleven thousand, seven hundred sixty".