352140721 has 4 divisors (see below), whose sum is σ = 353085172. Its totient is φ = 351196272.

The previous prime is 352140689. The next prime is 352140751. The reversal of 352140721 is 127041253.

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 67881121 + 284259600 = 8239^2 + 16860^2 .

It is a cyclic number.

It is not a de Polignac number, because 352140721 - 2⁵ = 352140689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (352140751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471666 + ... + 472411.

It is an arithmetic number, because the mean of its divisors is an integer number (88271293).

Almost surely, 2^352140721 is an apocalyptic number.

It is an amenable number.

352140721 is a deficient number, since it is larger than the sum of its proper divisors (944451).

352140721 is an equidigital number, since it uses as much as digits as its factorization.

352140721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944450.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 352140721 is about 18765.4128918071. The cubic root of 352140721 is about 706.1637443305.

Adding to 352140721 its reverse (127041253), we get a palindrome (479181974).

The spelling of 352140721 in words is "three hundred fifty-two million, one hundred forty thousand, seven hundred twenty-one".