1311022021 has 8 divisors (see below), whose sum is σ = 1385398080. Its totient is φ = 1237183488.

The previous prime is 1311021991. The next prime is 1311022033. The reversal of 1311022021 is 1202201131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311022021 - 2²³ = 1302633413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311021992 and 1311022010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311022051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129361 + ... + 139126.

It is an arithmetic number, because the mean of its divisors is an integer number (173174760).

Almost surely, 2^1311022021 is an apocalyptic number.

It is an amenable number.

1311022021 is a deficient number, since it is larger than the sum of its proper divisors (74376059).

1311022021 is a wasteful number, since it uses less digits than its factorization.

1311022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268763.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1311022021 is about 36208.0380716768. The cubic root of 1311022021 is about 1094.4686568144.

Adding to 1311022021 its reverse (1202201131), we get a palindrome (2513223152).

The spelling of 1311022021 in words is "one billion, three hundred eleven million, twenty-two thousand, twenty-one".