353130021 has 18 divisors (see below), whose sum is σ = 527074470. Its totient is φ = 227820240.

The previous prime is 353129983. The next prime is 353130047. The reversal of 353130021 is 120031353.

It can be written as a sum of positive squares in only one way, i.e., 352913796 + 216225 = 18786^2 + 465^2 .

It is not a de Polignac number, because 353130021 - 2⁶ = 353129957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 353129976 and 353130003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (353130521) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11766 + ... + 29063.

It is an arithmetic number, because the mean of its divisors is an integer number (29281915).

Almost surely, 2^353130021 is an apocalyptic number.

353130021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

353130021 is a deficient number, since it is larger than the sum of its proper divisors (173944449).

353130021 is a wasteful number, since it uses less digits than its factorization.

353130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40897 (or 40863 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 353130021 is about 18791.7540692720. The cubic root of 353130021 is about 706.8244220555.

Adding to 353130021 its reverse (120031353), we get a palindrome (473161374).

The spelling of 353130021 in words is "three hundred fifty-three million, one hundred thirty thousand, twenty-one".