221554422011413 has 4 divisors (see below), whose sum is σ = 221622529737388. Its totient is φ = 221486314285440.

The previous prime is 221554422011353. The next prime is 221554422011459. The reversal of 221554422011413 is 314110224455122.

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 190875030957009 + 30679391054404 = 13815753^2 + 5538898^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221554422011413 is a prime.

It is a super-2 number, since 2×221554422011413² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221554422071413) 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, 34053858108 + ... + 34053864613.

It is an arithmetic number, because the mean of its divisors is an integer number (55405632434347).

Almost surely, 2^{221554422011413} is an apocalyptic number.

It is an amenable number.

221554422011413 is a deficient number, since it is larger than the sum of its proper divisors (68107725975).

221554422011413 is an equidigital number, since it uses as much as digits as its factorization.

221554422011413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68107725974.

The product of its (nonzero) digits is 76800, while the sum is 37.

Adding to 221554422011413 its reverse (314110224455122), we get a palindrome (535664646466535).

The spelling of 221554422011413 in words is "two hundred twenty-one trillion, five hundred fifty-four billion, four hundred twenty-two million, eleven thousand, four hundred thirteen".