1311041021 has 8 divisors (see below), whose sum is σ = 1385546400. Its totient is φ = 1237086000.

The previous prime is 1311040993. The next prime is 1311041023. The reversal of 1311041021 is 1201401131.

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 1311041021 - 2⁶ = 1311040957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311040987 and 1311041005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311041023) 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, 132686 + ... + 142223.

It is an arithmetic number, because the mean of its divisors is an integer number (173193300).

Almost surely, 2^1311041021 is an apocalyptic number.

It is an amenable number.

1311041021 is a deficient number, since it is larger than the sum of its proper divisors (74505379).

1311041021 is a wasteful number, since it uses less digits than its factorization.

1311041021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275179.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1311041021 is about 36208.3004434066. The cubic root of 1311041021 is about 1094.4739439882.

Adding to 1311041021 its reverse (1201401131), we get a palindrome (2512442152).

The spelling of 1311041021 in words is "one billion, three hundred eleven million, forty-one thousand, twenty-one".