1021200112121 has 4 divisors (see below), whose sum is σ = 1167085842432. Its totient is φ = 875314381812.

The previous prime is 1021200112117. The next prime is 1021200112201. The reversal of 1021200112121 is 1212110021201.

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 1021200112121 - 2² = 1021200112117 is a prime.

It is a super-2 number, since 2×1021200112121² (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 = 1021200112096 and 1021200112105.

It is not an unprimeable number, because it can be changed into a prime (1021200112111) 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, 72942865145 + ... + 72942865158.

It is an arithmetic number, because the mean of its divisors is an integer number (291771460608).

Almost surely, 2^{1021200112121} is an apocalyptic number.

It is an amenable number.

1021200112121 is a deficient number, since it is larger than the sum of its proper divisors (145885730311).

1021200112121 is an equidigital number, since it uses as much as digits as its factorization.

1021200112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145885730310.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021200112121 its reverse (1212110021201), we get a palindrome (2233310133322).

The spelling of 1021200112121 in words is "one trillion, twenty-one billion, two hundred million, one hundred twelve thousand, one hundred twenty-one".