21705767260 has 24 divisors (see below), whose sum is σ = 45706328640. Its totient is φ = 8658646464.

The previous prime is 21705767233. The next prime is 21705767267. The reversal of 21705767260 is 6276750712.

It is a super-2 number, since 2×21705767260² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21705767267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1471255 + ... + 1485934.

It is an arithmetic number, because the mean of its divisors is an integer number (1904430360).

Almost surely, 2^21705767260 is an apocalyptic number.

21705767260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21705767260 is an abundant number, since it is smaller than the sum of its proper divisors (24000561380).

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

21705767260 is a wasteful number, since it uses less digits than its factorization.

21705767260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957565 (or 2957563 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 43.

The spelling of 21705767260 in words is "twenty-one billion, seven hundred five million, seven hundred sixty-seven thousand, two hundred sixty".