1321310111221 has 16 divisors (see below), whose sum is σ = 1362636587520. Its totient is φ = 1280652497280.

The previous prime is 1321310111083. The next prime is 1321310111239. The reversal of 1321310111221 is 1221110131231.

It is a cyclic number.

It is not a de Polignac number, because 1321310111221 - 2²¹ = 1321308014069 is a prime.

It is a super-2 number, since 2×1321310111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321310111021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1936836 + ... + 2528626.

It is an arithmetic number, because the mean of its divisors is an integer number (85164786720).

Almost surely, 2^{1321310111221} is an apocalyptic number.

It is an amenable number.

1321310111221 is a deficient number, since it is larger than the sum of its proper divisors (41326476299).

1321310111221 is a wasteful number, since it uses less digits than its factorization.

1321310111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592356.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1321310111221 its reverse (1221110131231), we get a palindrome (2542420242452).

The spelling of 1321310111221 in words is "one trillion, three hundred twenty-one billion, three hundred ten million, one hundred eleven thousand, two hundred twenty-one".