221412500237221 has 8 divisors (see below), whose sum is σ = 227396856113784. Its totient is φ = 215428156689600.

The previous prime is 221412500237177. The next prime is 221412500237281. The reversal of 221412500237221 is 122732005214122.

It can be written as a sum of positive squares in 4 ways, for example, as 169095849586596 + 52316650650625 = 13003686^2 + 7233025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221412500237221 - 2⁹ = 221412500236709 is a prime.

It is a super-2 number, since 2×221412500237221² (a number of 29 digits) contains 22 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 (221412500237281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42185271 + ... + 47142571.

It is an arithmetic number, because the mean of its divisors is an integer number (28424607014223).

Almost surely, 2^{221412500237221} is an apocalyptic number.

It is an amenable number.

221412500237221 is a deficient number, since it is larger than the sum of its proper divisors (5984355876563).

221412500237221 is a wasteful number, since it uses less digits than its factorization.

221412500237221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6164471.

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 221412500237221 in words is "two hundred twenty-one trillion, four hundred twelve billion, five hundred million, two hundred thirty-seven thousand, two hundred twenty-one".