1002021103123 has 4 divisors (see below), whose sum is σ = 1002025496808. Its totient is φ = 1002016709440.

The previous prime is 1002021103117. The next prime is 1002021103129. The reversal of 1002021103123 is 3213011202001.

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

It is an interprime number because it is at equal distance from previous prime (1002021103117) and next prime (1002021103129).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002021103123 is a prime.

It is a super-2 number, since 2×1002021103123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002021103097 and 1002021103106.

It is not an unprimeable number, because it can be changed into a prime (1002021103129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1834873 + ... + 2317498.

It is an arithmetic number, because the mean of its divisors is an integer number (250506374202).

Almost surely, 2^{1002021103123} is an apocalyptic number.

1002021103123 is a deficient number, since it is larger than the sum of its proper divisors (4393685).

1002021103123 is an equidigital number, since it uses as much as digits as its factorization.

1002021103123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4393684.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1002021103123 its reverse (3213011202001), we get a palindrome (4215032305124).

The spelling of 1002021103123 in words is "one trillion, two billion, twenty-one million, one hundred three thousand, one hundred twenty-three".