221342115645 has 32 divisors (see below), whose sum is σ = 449710967040. Its totient is φ = 101184966720.

The previous prime is 221342115641. The next prime is 221342115661. The reversal of 221342115645 is 546511243122.

221342115645 is a `hidden beast` number, since 2 + 2 + 1 + 3 + 4 + 2 + 1 + 1 + 5 + 645 = 666.

It is not a de Polignac number, because 221342115645 - 2² = 221342115641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221342115641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117111286 + ... + 117113175.

It is an arithmetic number, because the mean of its divisors is an integer number (14053467720).

Almost surely, 2^221342115645 is an apocalyptic number.

It is an amenable number.

221342115645 is an abundant number, since it is smaller than the sum of its proper divisors (228368851395).

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

221342115645 is a wasteful number, since it uses less digits than its factorization.

221342115645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234224482 (or 234224476 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

Adding to 221342115645 its reverse (546511243122), we get a palindrome (767853358767).

The spelling of 221342115645 in words is "two hundred twenty-one billion, three hundred forty-two million, one hundred fifteen thousand, six hundred forty-five".