1021231002131 has 4 divisors (see below), whose sum is σ = 1021449265200. Its totient is φ = 1021012739064.

The previous prime is 1021231002047. The next prime is 1021231002191. The reversal of 1021231002131 is 1312001321201.

1021231002131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021231002131 is a prime.

It is a super-2 number, since 2×1021231002131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021231002191) 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, 109124516 + ... + 109133873.

It is an arithmetic number, because the mean of its divisors is an integer number (255362316300).

Almost surely, 2^{1021231002131} is an apocalyptic number.

1021231002131 is a deficient number, since it is larger than the sum of its proper divisors (218263069).

1021231002131 is an equidigital number, since it uses as much as digits as its factorization.

1021231002131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218263068.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1021231002131 its reverse (1312001321201), we get a palindrome (2333232323332).

The spelling of 1021231002131 in words is "one trillion, twenty-one billion, two hundred thirty-one million, two thousand, one hundred thirty-one".