10012100121 has 8 divisors (see below), whose sum is σ = 14832740960. Its totient is φ = 6674733396.

The previous prime is 10012100117. The next prime is 10012100143. The reversal of 10012100121 is 12100121001.

It is a happy number.

It is not a de Polignac number, because 10012100121 - 2² = 10012100117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10012100221) 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 7 ways as a sum of consecutive naturals, for example, 185409235 + ... + 185409288.

It is an arithmetic number, because the mean of its divisors is an integer number (1854092620).

Almost surely, 2^10012100121 is an apocalyptic number.

It is an amenable number.

10012100121 is a deficient number, since it is larger than the sum of its proper divisors (4820640839).

10012100121 is an equidigital number, since it uses as much as digits as its factorization.

10012100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370818532 (or 370818526 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10012100121 its reverse (12100121001), we get a palindrome (22112221122).

The spelling of 10012100121 in words is "ten billion, twelve million, one hundred thousand, one hundred twenty-one".