1021310123005 has 4 divisors (see below), whose sum is σ = 1225572147612. Its totient is φ = 817048098400.

The previous prime is 1021310122981. The next prime is 1021310123023. The reversal of 1021310123005 is 5003210131201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 741482876836 + 279827246169 = 861094^2 + 528987^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1021310123005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102131012296 + ... + 102131012305.

It is an arithmetic number, because the mean of its divisors is an integer number (306393036903).

Almost surely, 2^{1021310123005} is an apocalyptic number.

It is an amenable number.

1021310123005 is a deficient number, since it is larger than the sum of its proper divisors (204262024607).

1021310123005 is an equidigital number, since it uses as much as digits as its factorization.

1021310123005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204262024606.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 1021310123005 its reverse (5003210131201), we get a palindrome (6024520254206).

The spelling of 1021310123005 in words is "one trillion, twenty-one billion, three hundred ten million, one hundred twenty-three thousand, five".