221421251705413 has 4 divisors (see below), whose sum is σ = 224454419537068. Its totient is φ = 218388083873760.

The previous prime is 221421251705371. The next prime is 221421251705509. The reversal of 221421251705413 is 314507152124122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116173001176164 + 105248250529249 = 10778358^2 + 10259057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221421251705413 is a prime.

It is a super-3 number, since 3×221421251705413³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421251705113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516583915718 + ... + 1516583915863.

It is an arithmetic number, because the mean of its divisors is an integer number (56113604884267).

Almost surely, 2^{221421251705413} is an apocalyptic number.

It is an amenable number.

221421251705413 is a deficient number, since it is larger than the sum of its proper divisors (3033167831655).

221421251705413 is an equidigital number, since it uses as much as digits as its factorization.

221421251705413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033167831654.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 221421251705413 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, seven hundred five thousand, four hundred thirteen".