223056899521 has 3 divisors (see below), whose sum is σ = 223057371811. Its totient is φ = 223056427232.

The previous prime is 223056899509. The next prime is 223056899557. The reversal of 223056899521 is 125998650322.

The square root of 223056899521 is 472289.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 125998650322 = 2 ⋅62999325161.

It can be written as a sum of positive squares in only one way, i.e., 148811549121 + 74245350400 = 385761^2 + 272480^2 .

It is a de Polignac number, because none of the positive numbers 2^k-223056899521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223056899621) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 236145 + ... + 708433.

Almost surely, 2^223056899521 is an apocalyptic number.

223056899521 is the 472289-th square number.

223056899521 is the 236145-th centered octagonal number.

It is an amenable number.

223056899521 is a deficient number, since it is larger than the sum of its proper divisors (472290).

223056899521 is an frugal number, since it uses more digits than its factorization.

223056899521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944578 (or 472289 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 223056899521 in words is "two hundred twenty-three billion, fifty-six million, eight hundred ninety-nine thousand, five hundred twenty-one".