1320240021221 has 4 divisors (see below), whose sum is σ = 1440261841344. Its totient is φ = 1200218201100.

The previous prime is 1320240021203. The next prime is 1320240021229. The reversal of 1320240021221 is 1221200420231.

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 a de Polignac number, because none of the positive numbers 2^k-1320240021221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320240021193 and 1320240021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320240021229) 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, 60010910045 + ... + 60010910066.

It is an arithmetic number, because the mean of its divisors is an integer number (360065460336).

Almost surely, 2^{1320240021221} is an apocalyptic number.

1320240021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1320240021221 is a deficient number, since it is larger than the sum of its proper divisors (120021820123).

1320240021221 is a wasteful number, since it uses less digits than its factorization.

1320240021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120021820122.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1320240021221 its reverse (1221200420231), we get a palindrome (2541440441452).

The spelling of 1320240021221 in words is "one trillion, three hundred twenty billion, two hundred forty million, twenty-one thousand, two hundred twenty-one".