221040251321 has 4 divisors (see below), whose sum is σ = 221044032000. Its totient is φ = 221036470644.

The previous prime is 221040251317. The next prime is 221040251371. The reversal of 221040251321 is 123152040122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221040251321 - 2² = 221040251317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221040251371) 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, 1801241 + ... + 1920038.

It is an arithmetic number, because the mean of its divisors is an integer number (55261008000).

Almost surely, 2^221040251321 is an apocalyptic number.

It is an amenable number.

221040251321 is a deficient number, since it is larger than the sum of its proper divisors (3780679).

221040251321 is an equidigital number, since it uses as much as digits as its factorization.

221040251321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780678.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 221040251321 its reverse (123152040122), we get a palindrome (344192291443).

The spelling of 221040251321 in words is "two hundred twenty-one billion, forty million, two hundred fifty-one thousand, three hundred twenty-one".