1321211023221 has 16 divisors (see below), whose sum is σ = 1809335634624. Its totient is φ = 856949768064.

The previous prime is 1321211023189. The next prime is 1321211023247. The reversal of 1321211023221 is 1223201121231.

It is not a de Polignac number, because 1321211023221 - 2⁵ = 1321211023189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321211023261) 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, 1521505 + ... + 2226521.

It is an arithmetic number, because the mean of its divisors is an integer number (113083477164).

Almost surely, 2^{1321211023221} is an apocalyptic number.

It is an amenable number.

1321211023221 is a deficient number, since it is larger than the sum of its proper divisors (488124611403).

1321211023221 is a wasteful number, since it uses less digits than its factorization.

1321211023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721940.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1321211023221 its reverse (1223201121231), we get a palindrome (2544412144452).

The spelling of 1321211023221 in words is "one trillion, three hundred twenty-one billion, two hundred eleven million, twenty-three thousand, two hundred twenty-one".