221412201251 has 4 divisors (see below), whose sum is σ = 221420408472. Its totient is φ = 221403994032.

The previous prime is 221412201233. The next prime is 221412201271. The reversal of 221412201251 is 152102214122.

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

It is a cyclic number.

It is not a de Polignac number, because 221412201251 - 2¹⁰ = 221412200227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221412201271) 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 3 ways as a sum of consecutive naturals, for example, 4063010 + ... + 4117143.

It is an arithmetic number, because the mean of its divisors is an integer number (55355102118).

Almost surely, 2^221412201251 is an apocalyptic number.

221412201251 is a deficient number, since it is larger than the sum of its proper divisors (8207221).

221412201251 is an equidigital number, since it uses as much as digits as its factorization.

221412201251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8207220.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 221412201251 its reverse (152102214122), we get a palindrome (373514415373).

The spelling of 221412201251 in words is "two hundred twenty-one billion, four hundred twelve million, two hundred one thousand, two hundred fifty-one".