221354120543 has 4 divisors (see below), whose sum is σ = 221853791688. Its totient is φ = 220854449400.

The previous prime is 221354120521. The next prime is 221354120609. The reversal of 221354120543 is 345021453122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345021453122 = 2 ⋅172510726561.

It is a cyclic number.

It is not a de Polignac number, because 221354120543 - 2¹² = 221354116447 is a prime.

It is a super-2 number, since 2×221354120543² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221354120443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249834908 + ... + 249835793.

It is an arithmetic number, because the mean of its divisors is an integer number (55463447922).

Almost surely, 2^221354120543 is an apocalyptic number.

221354120543 is a deficient number, since it is larger than the sum of its proper divisors (499671145).

221354120543 is an equidigital number, since it uses as much as digits as its factorization.

221354120543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499671144.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 221354120543 its reverse (345021453122), we get a palindrome (566375573665).

The spelling of 221354120543 in words is "two hundred twenty-one billion, three hundred fifty-four million, one hundred twenty thousand, five hundred forty-three".