221444135152423 has 8 divisors (see below), whose sum is σ = 225636609840768. Its totient is φ = 217252189481184.

The previous prime is 221444135152391. The next prime is 221444135152483. The reversal of 221444135152423 is 324251531444122.

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

It is a cyclic number.

It is not a de Polignac number, because 221444135152423 - 2⁵ = 221444135152391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221444135152423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221444135152483) 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, 131409111 + ... + 133083592.

It is an arithmetic number, because the mean of its divisors is an integer number (28204576230096).

Almost surely, 2^{221444135152423} is an apocalyptic number.

221444135152423 is a deficient number, since it is larger than the sum of its proper divisors (4192474688345).

221444135152423 is a wasteful number, since it uses less digits than its factorization.

221444135152423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264508553.

The product of its digits is 921600, while the sum is 43.

Adding to 221444135152423 its reverse (324251531444122), we get a palindrome (545695666596545).

The spelling of 221444135152423 in words is "two hundred twenty-one trillion, four hundred forty-four billion, one hundred thirty-five million, one hundred fifty-two thousand, four hundred twenty-three".