221543223154734 has 48 divisors (see below), whose sum is σ = 481499277256944. Its totient is φ = 67924557792000.

The previous prime is 221543223154733. The next prime is 221543223154787. The reversal of 221543223154734 is 437451322345122.

It is a happy number.

221543223154734 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221543223154734² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221543223154733) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 388477417 + ... + 389047284.

It is an arithmetic number, because the mean of its divisors is an integer number (10031234942853).

Almost surely, 2^{221543223154734} is an apocalyptic number.

221543223154734 is an abundant number, since it is smaller than the sum of its proper divisors (259956054102210).

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

221543223154734 is a wasteful number, since it uses less digits than its factorization.

221543223154734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777525013 (or 777525000 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 48.

Adding to 221543223154734 its reverse (437451322345122), we get a palindrome (658994545499856).

The spelling of 221543223154734 in words is "two hundred twenty-one trillion, five hundred forty-three billion, two hundred twenty-three million, one hundred fifty-four thousand, seven hundred thirty-four".