1321010321221 has 4 divisors (see below), whose sum is σ = 1321244009932. Its totient is φ = 1320776632512.

The previous prime is 1321010321149. The next prime is 1321010321233. The reversal of 1321010321221 is 1221230101231.

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 453755820996 + 867254500225 = 673614^2 + 931265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321010321221 - 2³⁷ = 1183571367749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321010321261) 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, 116835876 + ... + 116847181.

It is an arithmetic number, because the mean of its divisors is an integer number (330311002483).

Almost surely, 2^{1321010321221} is an apocalyptic number.

It is an amenable number.

1321010321221 is a deficient number, since it is larger than the sum of its proper divisors (233688711).

1321010321221 is an equidigital number, since it uses as much as digits as its factorization.

1321010321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233688710.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1321010321221 its reverse (1221230101231), we get a palindrome (2542240422452).

The spelling of 1321010321221 in words is "one trillion, three hundred twenty-one billion, ten million, three hundred twenty-one thousand, two hundred twenty-one".