1021023123203 has 4 divisors (see below), whose sum is σ = 1025295186720. Its totient is φ = 1016751059688.

The previous prime is 1021023123181. The next prime is 1021023123209. The reversal of 1021023123203 is 3023213201201.

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 1021023123203 - 2¹² = 1021023119107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021023123209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136031400 + ... + 2136031877.

It is an arithmetic number, because the mean of its divisors is an integer number (256323796680).

Almost surely, 2^{1021023123203} is an apocalyptic number.

1021023123203 is a deficient number, since it is larger than the sum of its proper divisors (4272063517).

1021023123203 is an equidigital number, since it uses as much as digits as its factorization.

1021023123203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4272063516.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1021023123203 its reverse (3023213201201), we get a palindrome (4044236324404).

The spelling of 1021023123203 in words is "one trillion, twenty-one billion, twenty-three million, one hundred twenty-three thousand, two hundred three".