221434341021 has 6 divisors (see below), whose sum is σ = 319849603710. Its totient is φ = 147622894008.

The previous prime is 221434340987. The next prime is 221434341047. The reversal of 221434341021 is 120143434122.

221434341021 is a `hidden beast` number, since 2 + 214 + 3 + 434 + 10 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 179848935396 + 41585405625 = 424086^2 + 203925^2 .

It is not a de Polignac number, because 221434341021 - 2¹⁴ = 221434324637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221434341221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12301907826 + ... + 12301907843.

It is an arithmetic number, because the mean of its divisors is an integer number (53308267285).

Almost surely, 2^221434341021 is an apocalyptic number.

It is an amenable number.

221434341021 is a deficient number, since it is larger than the sum of its proper divisors (98415262689).

221434341021 is a wasteful number, since it uses less digits than its factorization.

221434341021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24603815675 (or 24603815672 counting only the distinct ones).

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

Adding to 221434341021 its reverse (120143434122), we get a palindrome (341577775143).

The spelling of 221434341021 in words is "two hundred twenty-one billion, four hundred thirty-four million, three hundred forty-one thousand, twenty-one".