21655224340112 has 40 divisors (see below), whose sum is σ = 46026975111840. Its totient is φ = 9788293364480.

The previous prime is 21655224340111. The next prime is 21655224340117. The reversal of 21655224340112 is 21104342255612.

It is not an unprimeable number, because it can be changed into a prime (21655224340111) 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, 343658573 + ... + 343721580.

It is an arithmetic number, because the mean of its divisors is an integer number (1150674377796).

Almost surely, 2^{21655224340112} is an apocalyptic number.

21655224340112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21655224340112 is an abundant number, since it is smaller than the sum of its proper divisors (24371750771728).

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

21655224340112 is a wasteful number, since it uses less digits than its factorization.

21655224340112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687380351 (or 687380345 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

Adding to 21655224340112 its reverse (21104342255612), we get a palindrome (42759566595724).

The spelling of 21655224340112 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred twenty-four million, three hundred forty thousand, one hundred twelve".