221641225151751 has 12 divisors (see below), whose sum is σ = 320149954837128. Its totient is φ = 147760115918544.

The previous prime is 221641225151743. The next prime is 221641225151761. The reversal of 221641225151751 is 157151522146122.

221641225151751 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 4 + 122 + 5 + 1 + 517 + 5 + 1 = 666.

It is not a de Polignac number, because 221641225151751 - 2³ = 221641225151743 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 221641225151697 and 221641225151706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221641225151761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56397585 + ... + 60199418.

It is an arithmetic number, because the mean of its divisors is an integer number (26679162903094).

Almost surely, 2^{221641225151751} is an apocalyptic number.

221641225151751 is a deficient number, since it is larger than the sum of its proper divisors (98508729685377).

221641225151751 is a wasteful number, since it uses less digits than its factorization.

221641225151751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116808222 (or 116808219 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

Adding to 221641225151751 its reverse (157151522146122), we get a palindrome (378792747297873).

The spelling of 221641225151751 in words is "two hundred twenty-one trillion, six hundred forty-one billion, two hundred twenty-five million, one hundred fifty-one thousand, seven hundred fifty-one".