100000012121 has 4 divisors (see below), whose sum is σ = 101639356644. Its totient is φ = 98360667600.

The previous prime is 100000012103. The next prime is 100000012157. The reversal of 100000012121 is 121210000001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121210000001 = 4813 ⋅25183877.

It can be written as a sum of positive squares in 2 ways, for example, as 2319385600 + 97680626521 = 48160^2 + 312539^2 .

It is a cyclic number.

It is not a de Polignac number, because 100000012121 - 2¹⁴ = 99999995737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100000012099 and 100000012108.

It is not an unprimeable number, because it can be changed into a prime (100000018121) 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, 819672170 + ... + 819672291.

It is an arithmetic number, because the mean of its divisors is an integer number (25409839161).

Almost surely, 2^100000012121 is an apocalyptic number.

It is an amenable number.

100000012121 is a deficient number, since it is larger than the sum of its proper divisors (1639344523).

100000012121 is an equidigital number, since it uses as much as digits as its factorization.

100000012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639344522.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 100000012121 its reverse (121210000001), we get a palindrome (221210012122).

The spelling of 100000012121 in words is "one hundred billion, twelve thousand, one hundred twenty-one".