221154426534 has 16 divisors (see below), whose sum is σ = 442583087472. Its totient is φ = 73672436448.

The previous prime is 221154426509. The next prime is 221154426551. The reversal of 221154426534 is 435624451122.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221154426492 and 221154426501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11415949 + ... + 11435304.

It is an arithmetic number, because the mean of its divisors is an integer number (27661442967).

Almost surely, 2^221154426534 is an apocalyptic number.

221154426534 is an abundant number, since it is smaller than the sum of its proper divisors (221428660938).

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

221154426534 is a wasteful number, since it uses less digits than its factorization.

221154426534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22852871.

The product of its digits is 230400, while the sum is 39.

Adding to 221154426534 its reverse (435624451122), we get a palindrome (656778877656).

The spelling of 221154426534 in words is "two hundred twenty-one billion, one hundred fifty-four million, four hundred twenty-six thousand, five hundred thirty-four".