10101210121 has 4 divisors (see below), whose sum is σ = 10145709072. Its totient is φ = 10056711172.

The previous prime is 10101210083. The next prime is 10101210143. The reversal of 10101210121 is 12101210101.

10101210121 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, 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 10101210121 - 2²⁹ = 9564339209 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10101210098 and 10101210107.

It is not an unprimeable number, because it can be changed into a prime (10101210191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22249135 + ... + 22249588.

It is an arithmetic number, because the mean of its divisors is an integer number (2536427268).

Almost surely, 2^10101210121 is an apocalyptic number.

It is an amenable number.

10101210121 is a deficient number, since it is larger than the sum of its proper divisors (44498951).

10101210121 is an equidigital number, since it uses as much as digits as its factorization.

10101210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44498950.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 10101210121 its reverse (12101210101), we get a palindrome (22202420222).

The spelling of 10101210121 in words is "ten billion, one hundred one million, two hundred ten thousand, one hundred twenty-one".