20002121001123 has 4 divisors (see below), whose sum is σ = 26669494668168. Its totient is φ = 13334747334080.

The previous prime is 20002121001043. The next prime is 20002121001143. The reversal of 20002121001123 is 32110012120002.

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

It is a cyclic number.

It is not a de Polignac number, because 20002121001123 - 2¹⁷ = 20002120870051 is a prime.

It is a super-2 number, since 2×20002121001123² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20002121001143) 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, 3333686833518 + ... + 3333686833523.

It is an arithmetic number, because the mean of its divisors is an integer number (6667373667042).

Almost surely, 2^{20002121001123} is an apocalyptic number.

20002121001123 is a deficient number, since it is larger than the sum of its proper divisors (6667373667045).

20002121001123 is an equidigital number, since it uses as much as digits as its factorization.

20002121001123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667373667044.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20002121001123 its reverse (32110012120002), we get a palindrome (52112133121125).

The spelling of 20002121001123 in words is "twenty trillion, two billion, one hundred twenty-one million, one thousand, one hundred twenty-three".