351232660021 has 4 divisors (see below), whose sum is σ = 351439634412. Its totient is φ = 351025685632.

The previous prime is 351232660003. The next prime is 351232660033. The reversal of 351232660021 is 120066232153.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178105100625 + 173127559396 = 422025^2 + 416086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-351232660021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351232660061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103484650 + ... + 103488043.

It is an arithmetic number, because the mean of its divisors is an integer number (87859908603).

Almost surely, 2^351232660021 is an apocalyptic number.

It is an amenable number.

351232660021 is a deficient number, since it is larger than the sum of its proper divisors (206974391).

351232660021 is a wasteful number, since it uses less digits than its factorization.

351232660021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206974390.

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 351232660021 its reverse (120066232153), we get a palindrome (471298892174).

The spelling of 351232660021 in words is "three hundred fifty-one billion, two hundred thirty-two million, six hundred sixty thousand, twenty-one".