221060661405 has 16 divisors (see below), whose sum is σ = 355474435200. Its totient is φ = 117306560448.

The previous prime is 221060661403. The next prime is 221060661413. The reversal of 221060661405 is 504166060122.

It is not a de Polignac number, because 221060661405 - 2¹ = 221060661403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221060661403) 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, 37025602 + ... + 37031571.

It is an arithmetic number, because the mean of its divisors is an integer number (22217152200).

Almost surely, 2^221060661405 is an apocalyptic number.

It is an amenable number.

221060661405 is a deficient number, since it is larger than the sum of its proper divisors (134413773795).

221060661405 is a wasteful number, since it uses less digits than its factorization.

221060661405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74057380.

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 221060661405 in words is "two hundred twenty-one billion, sixty million, six hundred sixty-one thousand, four hundred five".