3420955921 has 4 divisors (see below), whose sum is σ = 3426725412. Its totient is φ = 3415186432.

The previous prime is 3420955919. The next prime is 3420955943. The reversal of 3420955921 is 1295590243.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1295590243 = 83 ⋅15609521.

It can be written as a sum of positive squares in 2 ways, for example, as 2993293521 + 427662400 = 54711^2 + 20680^2 .

It is a cyclic number.

It is not a de Polignac number, because 3420955921 - 2¹ = 3420955919 is a prime.

It is a super-3 number, since 3×3420955921³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3420955961) 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, 2883856 + ... + 2885041.

It is an arithmetic number, because the mean of its divisors is an integer number (856681353).

Almost surely, 2^3420955921 is an apocalyptic number.

It is an amenable number.

3420955921 is a deficient number, since it is larger than the sum of its proper divisors (5769491).

3420955921 is an equidigital number, since it uses as much as digits as its factorization.

3420955921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5769490.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 3420955921 is about 58488.9384499326. The cubic root of 3420955921 is about 1506.7776144304. Note that the first 3 decimals are identical.

The spelling of 3420955921 in words is "three billion, four hundred twenty million, nine hundred fifty-five thousand, nine hundred twenty-one".