12002121123 has 4 divisors (see below), whose sum is σ = 16002828168. Its totient is φ = 8001414080.

The previous prime is 12002121121. The next prime is 12002121137. The reversal of 12002121123 is 32112120021.

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 12002121123 - 2¹ = 12002121121 is a prime.

It is a super-2 number, since 2×12002121123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12002121121) 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, 2000353518 + ... + 2000353523.

It is an arithmetic number, because the mean of its divisors is an integer number (4000707042).

Almost surely, 2^12002121123 is an apocalyptic number.

12002121123 is a deficient number, since it is larger than the sum of its proper divisors (4000707045).

12002121123 is an equidigital number, since it uses as much as digits as its factorization.

12002121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000707044.

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

Adding to 12002121123 its reverse (32112120021), we get a palindrome (44114241144).

The spelling of 12002121123 in words is "twelve billion, two million, one hundred twenty-one thousand, one hundred twenty-three".