1021311212131 has 4 divisors (see below), whose sum is σ = 1167212813872. Its totient is φ = 875409610392.

The previous prime is 1021311212063. The next prime is 1021311212183. The reversal of 1021311212131 is 1312121131201.

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 1021311212131 - 2⁷ = 1021311212003 is a prime.

It is a super-2 number, since 2×1021311212131² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021311212099 and 1021311212108.

It is not an unprimeable number, because it can be changed into a prime (1021311212191) 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, 72950800860 + ... + 72950800873.

It is an arithmetic number, because the mean of its divisors is an integer number (291803203468).

Almost surely, 2^{1021311212131} is an apocalyptic number.

1021311212131 is a deficient number, since it is larger than the sum of its proper divisors (145901601741).

1021311212131 is an equidigital number, since it uses as much as digits as its factorization.

1021311212131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145901601740.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1021311212131 its reverse (1312121131201), we get a palindrome (2333432343332).

The spelling of 1021311212131 in words is "one trillion, twenty-one billion, three hundred eleven million, two hundred twelve thousand, one hundred thirty-one".