21655224340060 has 12 divisors (see below), whose sum is σ = 45475971114168. Its totient is φ = 8662089736016.

The previous prime is 21655224340033. The next prime is 21655224340091. The reversal of 21655224340060 is 6004342255612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21655224339995 and 21655224340022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541380608482 + ... + 541380608521.

It is an arithmetic number, because the mean of its divisors is an integer number (3789664259514).

Almost surely, 2^{21655224340060} is an apocalyptic number.

21655224340060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21655224340060 is an abundant number, since it is smaller than the sum of its proper divisors (23820746774108).

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

21655224340060 is a wasteful number, since it uses less digits than its factorization.

21655224340060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082761217012 (or 1082761217010 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 21655224340060 its reverse (6004342255612), we get a palindrome (27659566595672).

The spelling of 21655224340060 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred twenty-four million, three hundred forty thousand, sixty".