1002120123 has 4 divisors (see below), whose sum is σ = 1336160168. Its totient is φ = 668080080.

The previous prime is 1002120121. The next prime is 1002120127. The reversal of 1002120123 is 3210212001.

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

It is not a de Polignac number, because 1002120123 - 2¹ = 1002120121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002120099 and 1002120108.

It is not an unprimeable number, because it can be changed into a prime (1002120121) 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, 167020018 + ... + 167020023.

It is an arithmetic number, because the mean of its divisors is an integer number (334040042).

Almost surely, 2^1002120123 is an apocalyptic number.

1002120123 is a deficient number, since it is larger than the sum of its proper divisors (334040045).

1002120123 is an equidigital number, since it uses as much as digits as its factorization.

1002120123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334040044.

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

The square root of 1002120123 is about 31656.2809407549. The cubic root of 1002120123 is about 1000.7062088184.

Adding to 1002120123 its reverse (3210212001), we get a palindrome (4212332124).

The spelling of 1002120123 in words is "one billion, two million, one hundred twenty thousand, one hundred twenty-three".