1210121010121 has 4 divisors (see below), whose sum is σ = 1210168061892. Its totient is φ = 1210073958352.

The previous prime is 1210121010083. The next prime is 1210121010169. The reversal of 1210121010121 is 1210101210121.

It is a happy number.

1210121010121 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 28195447225 + 1181925562896 = 167915^2 + 1087164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210121010121 - 2²¹ = 1210118912969 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210121010421) 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, 23487286 + ... + 23538751.

It is an arithmetic number, because the mean of its divisors is an integer number (302542015473).

Almost surely, 2^{1210121010121} is an apocalyptic number.

It is an amenable number.

1210121010121 is a deficient number, since it is larger than the sum of its proper divisors (47051771).

1210121010121 is an equidigital number, since it uses as much as digits as its factorization.

1210121010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47051770.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1210121010121 its reverse (1210101210121), we get a palindrome (2420222220242).

The spelling of 1210121010121 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, ten thousand, one hundred twenty-one".