221653231607 has 8 divisors (see below), whose sum is σ = 229687088400. Its totient is φ = 213645417664.

The previous prime is 221653231573. The next prime is 221653231609. The reversal of 221653231607 is 706132356122.

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 221653231607 - 2²⁶ = 221586122743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221653231609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6493382 + ... + 6527427.

It is an arithmetic number, because the mean of its divisors is an integer number (28710886050).

Almost surely, 2^221653231607 is an apocalyptic number.

221653231607 is a deficient number, since it is larger than the sum of its proper divisors (8033856793).

221653231607 is a wasteful number, since it uses less digits than its factorization.

221653231607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13021425.

The product of its (nonzero) digits is 90720, while the sum is 38.

Adding to 221653231607 its reverse (706132356122), we get a palindrome (927785587729).

The spelling of 221653231607 in words is "two hundred twenty-one billion, six hundred fifty-three million, two hundred thirty-one thousand, six hundred seven".