221656477115453 has 4 divisors (see below), whose sum is σ = 234695093416380. Its totient is φ = 208617860814528.

The previous prime is 221656477115321. The next prime is 221656477115537. The reversal of 221656477115453 is 354511774656122.

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 89968298166244 + 131688178949209 = 9485162^2 + 11475547^2 .

It is a cyclic number.

It is not a de Polignac number, because 221656477115453 - 2¹⁸ = 221656476853309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221656477115392 and 221656477115401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221656477175453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6519308150438 + ... + 6519308150471.

It is an arithmetic number, because the mean of its divisors is an integer number (58673773354095).

Almost surely, 2^{221656477115453} is an apocalyptic number.

It is an amenable number.

221656477115453 is a deficient number, since it is larger than the sum of its proper divisors (13038616300927).

221656477115453 is a wasteful number, since it uses less digits than its factorization.

221656477115453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13038616300926.

The product of its digits is 42336000, while the sum is 59.

The spelling of 221656477115453 in words is "two hundred twenty-one trillion, six hundred fifty-six billion, four hundred seventy-seven million, one hundred fifteen thousand, four hundred fifty-three".