221440134321 has 48 divisors (see below), whose sum is σ = 383443107840. Its totient is φ = 120401756640.

The previous prime is 221440134319. The next prime is 221440134341. The reversal of 221440134321 is 123431044122.

221440134321 is a `hidden beast` number, since 2 + 214 + 4 + 0 + 13 + 432 + 1 = 666.

It is not a de Polignac number, because 221440134321 - 2¹ = 221440134319 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221440134341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123301 + ... + 676818.

It is an arithmetic number, because the mean of its divisors is an integer number (7988398080).

Almost surely, 2^221440134321 is an apocalyptic number.

221440134321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221440134321 is a deficient number, since it is larger than the sum of its proper divisors (162002973519).

221440134321 is a wasteful number, since it uses less digits than its factorization.

221440134321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800346 (or 800343 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 221440134321 its reverse (123431044122), we get a palindrome (344871178443).

The spelling of 221440134321 in words is "two hundred twenty-one billion, four hundred forty million, one hundred thirty-four thousand, three hundred twenty-one".