1221333311021 has 8 divisors (see below), whose sum is σ = 1222036267584. Its totient is φ = 1220630525280.

The previous prime is 1221333310961. The next prime is 1221333311047. The reversal of 1221333311021 is 1201133331221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221333311021 - 2³⁸ = 946455404077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221333311321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15943016 + ... + 16019438.

It is an arithmetic number, because the mean of its divisors is an integer number (152754533448).

Almost surely, 2^{1221333311021} is an apocalyptic number.

It is an amenable number.

1221333311021 is a deficient number, since it is larger than the sum of its proper divisors (702956563).

1221333311021 is an equidigital number, since it uses as much as digits as its factorization.

1221333311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85411.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1221333311021 its reverse (1201133331221), we get a palindrome (2422466642242).

The spelling of 1221333311021 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-three million, three hundred eleven thousand, twenty-one".