221152012321 has 2 divisors, whose sum is σ = 221152012322. Its totient is φ = 221152012320.

The previous prime is 221152012303. The next prime is 221152012331. The reversal of 221152012321 is 123210251122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151819329600 + 69332682721 = 389640^2 + 263311^2 .

It is a cyclic number.

It is not a de Polignac number, because 221152012321 - 2¹¹ = 221152010273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221152012292 and 221152012301.

It is not a weakly prime, because it can be changed into another prime (221152012331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110576006160 + 110576006161.

It is an arithmetic number, because the mean of its divisors is an integer number (110576006161).

Almost surely, 2^221152012321 is an apocalyptic number.

It is an amenable number.

221152012321 is a deficient number, since it is larger than the sum of its proper divisors (1).

221152012321 is an equidigital number, since it uses as much as digits as its factorization.

221152012321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 221152012321 its reverse (123210251122), we get a palindrome (344362263443).

The spelling of 221152012321 in words is "two hundred twenty-one billion, one hundred fifty-two million, twelve thousand, three hundred twenty-one".