2100120012121 has 4 divisors (see below), whose sum is σ = 2100124376244. Its totient is φ = 2100115648000.

The previous prime is 2100120012103. The next prime is 2100120012139. The reversal of 2100120012121 is 1212100210012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2100120012103) and next prime (2100120012139).

It can be written as a sum of positive squares in 2 ways, for example, as 1837529358025 + 262590654096 = 1355555^2 + 512436^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100120012121 - 2⁷ = 2100120011993 is a prime.

It is a super-2 number, since 2×2100120012121² (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 (2100120012101) 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, 1355980 + ... + 2457421.

It is an arithmetic number, because the mean of its divisors is an integer number (525031094061).

Almost surely, 2^{2100120012121} is an apocalyptic number.

It is an amenable number.

2100120012121 is a deficient number, since it is larger than the sum of its proper divisors (4364123).

2100120012121 is an equidigital number, since it uses as much as digits as its factorization.

2100120012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4364122.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2100120012121 its reverse (1212100210012), we get a palindrome (3312220222133).

The spelling of 2100120012121 in words is "two trillion, one hundred billion, one hundred twenty million, twelve thousand, one hundred twenty-one".