1221132311221 has 4 divisors (see below), whose sum is σ = 1232987964832. Its totient is φ = 1209276657612.

The previous prime is 1221132311207. The next prime is 1221132311233.

It is a happy number.

1221132311221 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 1221132311221 - 2⁷ = 1221132311093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221132311192 and 1221132311201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221132311261) 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, 5927826651 + ... + 5927826856.

It is an arithmetic number, because the mean of its divisors is an integer number (308246991208).

Almost surely, 2^{1221132311221} is an apocalyptic number.

It is an amenable number.

1221132311221 is a deficient number, since it is larger than the sum of its proper divisors (11855653611).

1221132311221 is a wasteful number, since it uses less digits than its factorization.

1221132311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11855653610.

The product of its digits is 288, while the sum is 22.

The spelling of 1221132311221 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-two million, three hundred eleven thousand, two hundred twenty-one".