221310412421 has 12 divisors (see below), whose sum is σ = 257450448780. Its totient is φ = 189688947840.

The previous prime is 221310412403. The next prime is 221310412423. The reversal of 221310412421 is 124214013122.

It can be written as a sum of positive squares in 2 ways, for example, as 96496588321 + 124813824100 = 310639^2 + 353290^2 .

It is not a de Polignac number, because 221310412421 - 2¹⁴ = 221310396037 is a prime.

It is a super-2 number, since 2×221310412421² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221310412423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2859725 + ... + 2936093.

It is an arithmetic number, because the mean of its divisors is an integer number (21454204065).

Almost surely, 2^221310412421 is an apocalyptic number.

It is an amenable number.

221310412421 is a deficient number, since it is larger than the sum of its proper divisors (36140036359).

221310412421 is an equidigital number, since it uses as much as digits as its factorization.

221310412421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135524 (or 135517 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 221310412421 its reverse (124214013122), we get a palindrome (345524425543).

The spelling of 221310412421 in words is "two hundred twenty-one billion, three hundred ten million, four hundred twelve thousand, four hundred twenty-one".