1210100220121 has 4 divisors (see below), whose sum is σ = 1303184852452. Its totient is φ = 1117015587792.

The previous prime is 1210100220103. The next prime is 1210100220139. The reversal of 1210100220121 is 1210220010121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1210100220103) and next prime (1210100220139).

It can be written as a sum of positive squares in 2 ways, for example, as 171260234896 + 1038839985225 = 413836^2 + 1019235^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1210100220121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 93084632317 = 1210100220121 / (1 + 2 + 1 + 0 + 1 + 0 + 0 + 2 + 2 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210100220421) 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 3 ways as a sum of consecutive naturals, for example, 46542316146 + ... + 46542316171.

It is an arithmetic number, because the mean of its divisors is an integer number (325796213113).

Almost surely, 2^{1210100220121} is an apocalyptic number.

It is an amenable number.

1210100220121 is a deficient number, since it is larger than the sum of its proper divisors (93084632331).

1210100220121 is an equidigital number, since it uses as much as digits as its factorization.

1210100220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93084632330.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1210100220121 its reverse (1210220010121), we get a palindrome (2420320230242).

The spelling of 1210100220121 in words is "one trillion, two hundred ten billion, one hundred million, two hundred twenty thousand, one hundred twenty-one".