2100020001123 has 16 divisors (see below), whose sum is σ = 3054965682816. Its totient is φ = 1272576421440.

The previous prime is 2100020001089. The next prime is 2100020001161. The reversal of 2100020001123 is 3211000200012.

It is not a de Polignac number, because 2100020001123 - 2⁶ = 2100020001059 is a prime.

It is a super-2 number, since 2×2100020001123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2100020001099 and 2100020001108.

It is not an unprimeable number, because it can be changed into a prime (2100020001193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3812461 + ... + 4328382.

It is an arithmetic number, because the mean of its divisors is an integer number (190935355176).

Almost surely, 2^{2100020001123} is an apocalyptic number.

2100020001123 is a deficient number, since it is larger than the sum of its proper divisors (954945681693).

2100020001123 is a wasteful number, since it uses less digits than its factorization.

2100020001123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8148674.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 2100020001123 its reverse (3211000200012), we get a palindrome (5311020201135).

The spelling of 2100020001123 in words is "two trillion, one hundred billion, twenty million, one thousand, one hundred twenty-three".