1231021021031 has 2 divisors, whose sum is σ = 1231021021032. Its totient is φ = 1231021021030.

The previous prime is 1231021020947. The next prime is 1231021021033. The reversal of 1231021021031 is 1301201201321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231021021031 is a prime.

It is a super-2 number, since 2×1231021021031² (a number of 25 digits) contains 22 as substring.

Together with 1231021021033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231021021033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615510510515 + 615510510516.

It is an arithmetic number, because the mean of its divisors is an integer number (615510510516).

Almost surely, 2^{1231021021031} is an apocalyptic number.

1231021021031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231021021031 is an equidigital number, since it uses as much as digits as its factorization.

1231021021031 is an evil number, because the sum of its binary digits is even.

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

Adding to 1231021021031 its reverse (1301201201321), we get a palindrome (2532222222352).

The spelling of 1231021021031 in words is "one trillion, two hundred thirty-one billion, twenty-one million, twenty-one thousand, thirty-one".