1321011023221 has 16 divisors (see below), whose sum is σ = 1439079235200. Its totient is φ = 1207832447808.

The previous prime is 1321011023219. The next prime is 1321011023239. The reversal of 1321011023221 is 1223201101231.

It is not a de Polignac number, because 1321011023221 - 2¹ = 1321011023219 is a prime.

It is a super-3 number, since 3×1321011023221³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321011023201) 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, 850896 + ... + 1834678.

It is an arithmetic number, because the mean of its divisors is an integer number (89942452200).

Almost surely, 2^{1321011023221} is an apocalyptic number.

It is an amenable number.

1321011023221 is a deficient number, since it is larger than the sum of its proper divisors (118068211979).

1321011023221 is a wasteful number, since it uses less digits than its factorization.

1321011023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986268.

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

Adding to 1321011023221 its reverse (1223201101231), we get a palindrome (2544212124452).

The spelling of 1321011023221 in words is "one trillion, three hundred twenty-one billion, eleven million, twenty-three thousand, two hundred twenty-one".