1355145021 has 12 divisors (see below), whose sum is σ = 2072574972. Its totient is φ = 850286976.

The previous prime is 1355144983. The next prime is 1355145053. The reversal of 1355145021 is 1205415531.

It can be written as a sum of positive squares in 2 ways, for example, as 1042385796 + 312759225 = 32286^2 + 17685^2 .

It is not a de Polignac number, because 1355145021 - 2²¹ = 1353047869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355145521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4428426 + ... + 4428731.

It is an arithmetic number, because the mean of its divisors is an integer number (172714581).

Almost surely, 2^1355145021 is an apocalyptic number.

It is an amenable number.

1355145021 is a deficient number, since it is larger than the sum of its proper divisors (717429951).

1355145021 is a wasteful number, since it uses less digits than its factorization.

1355145021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8857180 (or 8857177 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1355145021 is about 36812.2944272698. The cubic root of 1355145021 is about 1106.6117007808.

The spelling of 1355145021 in words is "one billion, three hundred fifty-five million, one hundred forty-five thousand, twenty-one".