2100012100121 has 8 divisors (see below), whose sum is σ = 2339536027080. Its totient is φ = 1871628820992.

The previous prime is 2100012099961. The next prime is 2100012100159. The reversal of 2100012100121 is 1210012100012.

It can be written as a sum of positive squares in 4 ways, for example, as 323976117721 + 1776035982400 = 569189^2 + 1332680^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2100012100121 - 2¹⁸ = 2100011837977 is a prime.

It is a super-2 number, since 2×2100012100121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100012106121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2785161560 + ... + 2785162313.

It is an arithmetic number, because the mean of its divisors is an integer number (292442003385).

Almost surely, 2^{2100012100121} is an apocalyptic number.

It is an amenable number.

2100012100121 is a deficient number, since it is larger than the sum of its proper divisors (239523926959).

2100012100121 is a wasteful number, since it uses less digits than its factorization.

2100012100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5570323915.

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

Adding to 2100012100121 its reverse (1210012100012), we get a palindrome (3310024200133).

The spelling of 2100012100121 in words is "two trillion, one hundred billion, twelve million, one hundred thousand, one hundred twenty-one".