21355352453560 has 32 divisors (see below), whose sum is σ = 48059343491040. Its totient is φ = 8540398675584.

The previous prime is 21355352453509. The next prime is 21355352453569. The reversal of 21355352453560 is 6535425355312.

21355352453560 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21355352453560² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355352453569) 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, 54248487 + ... + 54640726.

It is an arithmetic number, because the mean of its divisors is an integer number (1501854484095).

Almost surely, 2^{21355352453560} is an apocalyptic number.

21355352453560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21355352453560 is an abundant number, since it is smaller than the sum of its proper divisors (26703991037480).

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

21355352453560 is a wasteful number, since it uses less digits than its factorization.

21355352453560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108894127 (or 108894123 counting only the distinct ones).

The product of its (nonzero) digits is 8100000, while the sum is 49.

The spelling of 21355352453560 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred fifty-two million, four hundred fifty-three thousand, five hundred sixty".