1311021404 has 24 divisors (see below), whose sum is σ = 2860411008. Its totient is φ = 510787440.

The previous prime is 1311021391. The next prime is 1311021421. The reversal of 1311021404 is 4041201131.

It is a happy number.

It is a super-2 number, since 2×1311021404² = 3437554243492262432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2127974 + ... + 2128589.

It is an arithmetic number, because the mean of its divisors is an integer number (119183792).

Almost surely, 2^1311021404 is an apocalyptic number.

1311021404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1311021404 is an abundant number, since it is smaller than the sum of its proper divisors (1549389604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311021404 is a wasteful number, since it uses less digits than its factorization.

1311021404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4256585 (or 4256583 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1311021404 is about 36208.0295514683. The cubic root of 1311021404 is about 1094.4684851195.

Adding to 1311021404 its reverse (4041201131), we get a palindrome (5352222535).

The spelling of 1311021404 in words is "one billion, three hundred eleven million, twenty-one thousand, four hundred four".