349022021 has 4 divisors (see below), whose sum is σ = 349492512. Its totient is φ = 348551532.

The previous prime is 349021997. The next prime is 349022029. The reversal of 349022021 is 120220943.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 349022021 - 2¹⁴ = 349005637 is a prime.

It is a super-2 number, since 2×349022021² = 243632742285848882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349022029) 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, 234131 + ... + 235616.

It is an arithmetic number, because the mean of its divisors is an integer number (87373128).

Almost surely, 2^349022021 is an apocalyptic number.

It is an amenable number.

349022021 is a deficient number, since it is larger than the sum of its proper divisors (470491).

349022021 is an equidigital number, since it uses as much as digits as its factorization.

349022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470490.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 349022021 is about 18682.1310615251. The cubic root of 349022021 is about 704.0728694426.

Adding to 349022021 its reverse (120220943), we get a palindrome (469242964).

The spelling of 349022021 in words is "three hundred forty-nine million, twenty-two thousand, twenty-one".