21069824760 has 64 divisors (see below), whose sum is σ = 70232752800. Its totient is φ = 5618619648.

The previous prime is 21069824759. The next prime is 21069824771. The reversal of 21069824760 is 6742896012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 9753469 + ... + 9755628.

Almost surely, 2^21069824760 is an apocalyptic number.

21069824760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21069824760 is an abundant number, since it is smaller than the sum of its proper divisors (49162928040).

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

21069824760 is a wasteful number, since it uses less digits than its factorization.

21069824760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19509117 (or 19509107 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 21069824760 in words is "twenty-one billion, sixty-nine million, eight hundred twenty-four thousand, seven hundred sixty".