1210020121221 has 8 divisors (see below), whose sum is σ = 1613382138720. Its totient is φ = 806669092272.

The previous prime is 1210020121199. The next prime is 1210020121259. The reversal of 1210020121221 is 1221210200121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1210020121221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1210020121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210020111221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2486670 + ... + 2933183.

It is an arithmetic number, because the mean of its divisors is an integer number (201672767340).

Almost surely, 2^{1210020121221} is an apocalyptic number.

It is an amenable number.

1210020121221 is a deficient number, since it is larger than the sum of its proper divisors (403362017499).

1210020121221 is an equidigital number, since it uses as much as digits as its factorization.

1210020121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5494275.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1210020121221 its reverse (1221210200121), we get a palindrome (2431230321342).

The spelling of 1210020121221 in words is "one trillion, two hundred ten billion, twenty million, one hundred twenty-one thousand, two hundred twenty-one".