221323204405 has 8 divisors (see below), whose sum is σ = 265595435352. Its totient is φ = 177053503488.

The previous prime is 221323204397. The next prime is 221323204429. The reversal of 221323204405 is 504402323122.

It can be written as a sum of positive squares in 4 ways, for example, as 4508182449 + 216815021956 = 67143^2 + 465634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221323204405 - 2³ = 221323204397 is a prime.

It is a super-2 number, since 2×221323204405² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434412 + ... + 794581.

It is an arithmetic number, because the mean of its divisors is an integer number (33199429419).

Almost surely, 2^221323204405 is an apocalyptic number.

It is an amenable number.

221323204405 is a deficient number, since it is larger than the sum of its proper divisors (44272230947).

221323204405 is a wasteful number, since it uses less digits than its factorization.

221323204405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265015.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 221323204405 its reverse (504402323122), we get a palindrome (725725527527).

The spelling of 221323204405 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred four thousand, four hundred five".