21705444060 has 24 divisors (see below), whose sum is σ = 60775243536. Its totient is φ = 5788118400.

The previous prime is 21705444053. The next prime is 21705444071. The reversal of 21705444060 is 6044450712.

It is a super-2 number, since 2×21705444060² (a number of 21 digits) contains 22 as substring.

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, 180878641 + ... + 180878760.

It is an arithmetic number, because the mean of its divisors is an integer number (2532301814).

Almost surely, 2^21705444060 is an apocalyptic number.

21705444060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21705444060 is an abundant number, since it is smaller than the sum of its proper divisors (39069799476).

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

21705444060 is a wasteful number, since it uses less digits than its factorization.

21705444060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361757413 (or 361757411 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

Adding to 21705444060 its reverse (6044450712), we get a palindrome (27749894772).

The spelling of 21705444060 in words is "twenty-one billion, seven hundred five million, four hundred forty-four thousand, sixty".