1121232120221 has 4 divisors (see below), whose sum is σ = 1132333428444. Its totient is φ = 1110130812000.

The previous prime is 1121232120157. The next prime is 1121232120233. The reversal of 1121232120221 is 1220212321211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 911096976196 + 210135144025 = 954514^2 + 458405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121232120221 - 2⁶ = 1121232120157 is a prime.

It is a super-2 number, since 2×1121232120221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121232120193 and 1121232120202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121232120521) 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, 5550653960 + ... + 5550654161.

It is an arithmetic number, because the mean of its divisors is an integer number (283083357111).

Almost surely, 2^{1121232120221} is an apocalyptic number.

It is an amenable number.

1121232120221 is a deficient number, since it is larger than the sum of its proper divisors (11101308223).

1121232120221 is a wasteful number, since it uses less digits than its factorization.

1121232120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101308222.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1121232120221 its reverse (1220212321211), we get a palindrome (2341444441432).

The spelling of 1121232120221 in words is "one trillion, one hundred twenty-one billion, two hundred thirty-two million, one hundred twenty thousand, two hundred twenty-one".