221637440373261 has 8 divisors (see below), whose sum is σ = 322381731452064. Its totient is φ = 134325721438320.

The previous prime is 221637440373187. The next prime is 221637440373287. The reversal of 221637440373261 is 162373044736122.

221637440373261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221637440373261 - 2⁴² = 217239393862157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221637440373361) 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, 3358143035926 + ... + 3358143035991.

It is an arithmetic number, because the mean of its divisors is an integer number (40297716431508).

Almost surely, 2^{221637440373261} is an apocalyptic number.

It is an amenable number.

221637440373261 is a deficient number, since it is larger than the sum of its proper divisors (100744291078803).

221637440373261 is a wasteful number, since it uses less digits than its factorization.

221637440373261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6716286071931.

The product of its (nonzero) digits is 6096384, while the sum is 51.

The spelling of 221637440373261 in words is "two hundred twenty-one trillion, six hundred thirty-seven billion, four hundred forty million, three hundred seventy-three thousand, two hundred sixty-one".