221346135645 has 8 divisors (see below), whose sum is σ = 354153817056. Its totient is φ = 118051272336.

The previous prime is 221346135641. The next prime is 221346135677. The reversal of 221346135645 is 546531643122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221346135645 - 2² = 221346135641 is a prime.

It is a super-2 number, since 2×221346135645² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221346135597 and 221346135606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221346135641) 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, 7378204507 + ... + 7378204536.

It is an arithmetic number, because the mean of its divisors is an integer number (44269227132).

Almost surely, 2^221346135645 is an apocalyptic number.

It is an amenable number.

221346135645 is a deficient number, since it is larger than the sum of its proper divisors (132807681411).

221346135645 is a wasteful number, since it uses less digits than its factorization.

221346135645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14756409051.

The product of its digits is 518400, while the sum is 42.

Adding to 221346135645 its reverse (546531643122), we get a palindrome (767877778767).

The spelling of 221346135645 in words is "two hundred twenty-one billion, three hundred forty-six million, one hundred thirty-five thousand, six hundred forty-five".