221701725691 has 4 divisors (see below), whose sum is σ = 223896792384. Its totient is φ = 219506659000.

The previous prime is 221701725667. The next prime is 221701725769. The reversal of 221701725691 is 196527107122.

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 221701725691 - 2¹¹ = 221701723643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221701725611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097533195 + ... + 1097533396.

It is an arithmetic number, because the mean of its divisors is an integer number (55974198096).

Almost surely, 2^221701725691 is an apocalyptic number.

221701725691 is a deficient number, since it is larger than the sum of its proper divisors (2195066693).

221701725691 is a wasteful number, since it uses less digits than its factorization.

221701725691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195066692.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 221701725691 in words is "two hundred twenty-one billion, seven hundred one million, seven hundred twenty-five thousand, six hundred ninety-one".