1355131821 has 16 divisors (see below), whose sum is σ = 1832463360. Its totient is φ = 890695680.

The previous prime is 1355131769. The next prime is 1355131831. The reversal of 1355131821 is 1281315531.

It is not a de Polignac number, because 1355131821 - 2²⁹ = 818260909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355131831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54285 + ... + 75213.

It is an arithmetic number, because the mean of its divisors is an integer number (114528960).

Almost surely, 2^1355131821 is an apocalyptic number.

It is an amenable number.

1355131821 is a deficient number, since it is larger than the sum of its proper divisors (477331539).

1355131821 is a wasteful number, since it uses less digits than its factorization.

1355131821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21236.

The product of its digits is 3600, while the sum is 30.

The square root of 1355131821 is about 36812.1151389050. The cubic root of 1355131821 is about 1106.6081077283.

The spelling of 1355131821 in words is "one billion, three hundred fifty-five million, one hundred thirty-one thousand, eight hundred twenty-one".