1000000020123 has 24 divisors (see below), whose sum is σ = 1555693329008. Its totient is φ = 615330136512.

The previous prime is 1000000020083. The next prime is 1000000020197. The reversal of 1000000020123 is 3210200000001.

It is a happy number.

It is not a de Polignac number, because 1000000020123 - 2¹⁰ = 1000000019099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1000000010123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 968961 + ... + 1714317.

Almost surely, 2^{1000000020123} is an apocalyptic number.

1000000020123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1000000020123 is a deficient number, since it is larger than the sum of its proper divisors (555693308885).

1000000020123 is a wasteful number, since it uses less digits than its factorization.

1000000020123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756843 (or 756840 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 1000000020123 its reverse (3210200000001), we get a palindrome (4210200020124).

The spelling of 1000000020123 in words is "one trillion, twenty thousand, one hundred twenty-three".