221411645054477 has 4 divisors (see below), whose sum is σ = 222046062375900. Its totient is φ = 220777227733056.

The previous prime is 221411645054399. The next prime is 221411645054491. The reversal of 221411645054477 is 774450546114122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58746261781321 + 162665383273156 = 7664611^2 + 12754034^2 .

It is a cyclic number.

It is not a de Polignac number, because 221411645054477 - 2²⁰ = 221411644005901 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 (221411645053477) 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, 317208660188 + ... + 317208660885.

It is an arithmetic number, because the mean of its divisors is an integer number (55511515593975).

Almost surely, 2^{221411645054477} is an apocalyptic number.

It is an amenable number.

221411645054477 is a deficient number, since it is larger than the sum of its proper divisors (634417321423).

221411645054477 is an equidigital number, since it uses as much as digits as its factorization.

221411645054477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634417321422.

The product of its (nonzero) digits is 7526400, while the sum is 53.

The spelling of 221411645054477 in words is "two hundred twenty-one trillion, four hundred eleven billion, six hundred forty-five million, fifty-four thousand, four hundred seventy-seven".