221406372327 has 16 divisors (see below), whose sum is σ = 338103597312. Its totient is φ = 126247005120.

The previous prime is 221406372323. The next prime is 221406372359. The reversal of 221406372327 is 723273604122.

It is not a de Polignac number, because 221406372327 - 2² = 221406372323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221406372323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11278374 + ... + 11297987.

It is an arithmetic number, because the mean of its divisors is an integer number (21131474832).

Almost surely, 2^221406372327 is an apocalyptic number.

221406372327 is a deficient number, since it is larger than the sum of its proper divisors (116697224985).

221406372327 is a wasteful number, since it uses less digits than its factorization.

221406372327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22576838.

The product of its (nonzero) digits is 169344, while the sum is 39.

Adding to 221406372327 its reverse (723273604122), we get a palindrome (944679976449).

The spelling of 221406372327 in words is "two hundred twenty-one billion, four hundred six million, three hundred seventy-two thousand, three hundred twenty-seven".