10012012121 has 4 divisors (see below), whose sum is σ = 10014076644. Its totient is φ = 10009947600.

The previous prime is 10012012111. The next prime is 10012012163. The reversal of 10012012121 is 12121021001.

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 7083578896 + 2928433225 = 84164^2 + 54115^2 .

It is a cyclic number.

It is not a de Polignac number, because 10012012121 - 2²⁶ = 9944903257 is a prime.

It is a super-2 number, since 2×10012012121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10012012111) 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, 1024970 + ... + 1034691.

It is an arithmetic number, because the mean of its divisors is an integer number (2503519161).

Almost surely, 2^10012012121 is an apocalyptic number.

It is an amenable number.

10012012121 is a deficient number, since it is larger than the sum of its proper divisors (2064523).

10012012121 is an equidigital number, since it uses as much as digits as its factorization.

10012012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064522.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10012012121 its reverse (12121021001), we get a palindrome (22133033122).

The spelling of 10012012121 in words is "ten billion, twelve million, twelve thousand, one hundred twenty-one".