352220421 has 16 divisors (see below), whose sum is σ = 544278528. Its totient is φ = 198433200.

The previous prime is 352220417. The next prime is 352220443. The reversal of 352220421 is 124022253.

It is not a de Polignac number, because 352220421 - 2² = 352220417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (352220521) 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, 116625 + ... + 119606.

It is an arithmetic number, because the mean of its divisors is an integer number (34017408).

Almost surely, 2^352220421 is an apocalyptic number.

It is an amenable number.

352220421 is a deficient number, since it is larger than the sum of its proper divisors (192058107).

352220421 is a wasteful number, since it uses less digits than its factorization.

352220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236312.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 352220421 is about 18767.5363593627. The cubic root of 352220421 is about 706.2170156522.

Adding to 352220421 its reverse (124022253), we get a palindrome (476242674).

The spelling of 352220421 in words is "three hundred fifty-two million, two hundred twenty thousand, four hundred twenty-one".