1231201022121 has 12 divisors (see below), whose sum is σ = 2032458830272. Its totient is φ = 703543441176.

The previous prime is 1231201022113. The next prime is 1231201022131. The reversal of 1231201022121 is 1212201021321.

It is not a de Polignac number, because 1231201022121 - 2³ = 1231201022113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231201022094 and 1231201022103.

It is not an unprimeable number, because it can be changed into a prime (1231201022131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9771436621 + ... + 9771436746.

Almost surely, 2^{1231201022121} is an apocalyptic number.

It is an amenable number.

1231201022121 is a deficient number, since it is larger than the sum of its proper divisors (801257808151).

1231201022121 is a wasteful number, since it uses less digits than its factorization.

1231201022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19542873380 (or 19542873377 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1231201022121 its reverse (1212201021321), we get a palindrome (2443402043442).

The spelling of 1231201022121 in words is "one trillion, two hundred thirty-one billion, two hundred one million, twenty-two thousand, one hundred twenty-one".