1221320211141 has 4 divisors (see below), whose sum is σ = 1628426948192. Its totient is φ = 814213474092.

The previous prime is 1221320211091. The next prime is 1221320211191. The reversal of 1221320211141 is 1411120231221.

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 an interprime number because it is at equal distance from previous prime (1221320211091) and next prime (1221320211191).

It is not a de Polignac number, because 1221320211141 - 2²⁹ = 1220783340229 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 (1221320211191) 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, 203553368521 + ... + 203553368526.

It is an arithmetic number, because the mean of its divisors is an integer number (407106737048).

Almost surely, 2^{1221320211141} is an apocalyptic number.

It is an amenable number.

1221320211141 is a deficient number, since it is larger than the sum of its proper divisors (407106737051).

1221320211141 is an equidigital number, since it uses as much as digits as its factorization.

1221320211141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407106737050.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 1221320211141 its reverse (1411120231221), we get a palindrome (2632440442362).

The spelling of 1221320211141 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, two hundred eleven thousand, one hundred forty-one".