1221321001322 has 4 divisors (see below), whose sum is σ = 1831981501986. Its totient is φ = 610660500660.

The previous prime is 1221321001309. The next prime is 1221321001337. The reversal of 1221321001322 is 2231001231221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1215839227801 + 5481773521 = 1102651^2 + 74039^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221321001294 and 1221321001303.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305330250329 + ... + 305330250332.

Almost surely, 2^{1221321001322} is an apocalyptic number.

1221321001322 is a deficient number, since it is larger than the sum of its proper divisors (610660500664).

1221321001322 is an equidigital number, since it uses as much as digits as its factorization.

1221321001322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610660500663.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1221321001322 its reverse (2231001231221), we get a palindrome (3452322232543).

The spelling of 1221321001322 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, one thousand, three hundred twenty-two".