2100001112121 has 16 divisors (see below), whose sum is σ = 3066432481728. Its totient is φ = 1267775692800.

The previous prime is 2100001112107. The next prime is 2100001112123. The reversal of 2100001112121 is 1212111000012.

It is not a de Polignac number, because 2100001112121 - 2¹¹ = 2100001110073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100001112097 and 2100001112106.

It is not an unprimeable number, because it can be changed into a prime (2100001112123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123797740 + ... + 123814701.

It is an arithmetic number, because the mean of its divisors is an integer number (191652030108).

Almost surely, 2^{2100001112121} is an apocalyptic number.

It is an amenable number.

2100001112121 is a deficient number, since it is larger than the sum of its proper divisors (966431369607).

2100001112121 is a wasteful number, since it uses less digits than its factorization.

2100001112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247612712.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2100001112121 its reverse (1212111000012), we get a palindrome (3312112112133).

It can be divided in two parts, 2100001 and 112121, that added together give a palindrome (2212122).

The spelling of 2100001112121 in words is "two trillion, one hundred billion, one million, one hundred twelve thousand, one hundred twenty-one".