1121020131221 has 4 divisors (see below), whose sum is σ = 1121052660000. Its totient is φ = 1120987602444.

The previous prime is 1121020131199. The next prime is 1121020131239. The reversal of 1121020131221 is 1221310201211.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-1121020131221 is a prime.

It is a super-2 number, since 2×1121020131221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121020131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121020131281) 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, 16212641 + ... + 16281638.

It is an arithmetic number, because the mean of its divisors is an integer number (280263165000).

Almost surely, 2^{1121020131221} is an apocalyptic number.

It is an amenable number.

1121020131221 is a deficient number, since it is larger than the sum of its proper divisors (32528779).

1121020131221 is an equidigital number, since it uses as much as digits as its factorization.

1121020131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32528778.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1121020131221 its reverse (1221310201211), we get a palindrome (2342330332432).

The spelling of 1121020131221 in words is "one trillion, one hundred twenty-one billion, twenty million, one hundred thirty-one thousand, two hundred twenty-one".