1210020013121 has 4 divisors (see below), whose sum is σ = 1210187404500. Its totient is φ = 1209852621744.

The previous prime is 1210020013109. The next prime is 1210020013123. The reversal of 1210020013121 is 1213100200121.

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 1115746451521 + 94273561600 = 1056289^2 + 307040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210020013121 - 2¹⁸ = 1210019750977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210020013096 and 1210020013105.

It is not an unprimeable number, because it can be changed into a prime (1210020013123) 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, 83684846 + ... + 83699303.

It is an arithmetic number, because the mean of its divisors is an integer number (302546851125).

Almost surely, 2^{1210020013121} is an apocalyptic number.

It is an amenable number.

1210020013121 is a deficient number, since it is larger than the sum of its proper divisors (167391379).

1210020013121 is an equidigital number, since it uses as much as digits as its factorization.

1210020013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167391378.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1210020013121 its reverse (1213100200121), we get a palindrome (2423120213242).

The spelling of 1210020013121 in words is "one trillion, two hundred ten billion, twenty million, thirteen thousand, one hundred twenty-one".