3321916921 has 4 divisors (see below), whose sum is σ = 3323967844. Its totient is φ = 3319866000.

The previous prime is 3321916867. The next prime is 3321916931. The reversal of 3321916921 is 1296191233.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1296191233 = 1409 ⋅919937.

It can be written as a sum of positive squares in 2 ways, for example, as 1038128400 + 2283788521 = 32220^2 + 47789^2 .

It is a cyclic number.

It is not a de Polignac number, because 3321916921 - 2²⁹ = 2785046009 is a prime.

It is a super-2 number, since 2×3321916921² = 22070264060052240482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3321916931) 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, 1023030 + ... + 1026271.

It is an arithmetic number, because the mean of its divisors is an integer number (830991961).

Almost surely, 2^3321916921 is an apocalyptic number.

It is an amenable number.

3321916921 is a deficient number, since it is larger than the sum of its proper divisors (2050923).

3321916921 is a wasteful number, since it uses less digits than its factorization.

3321916921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050922.

The product of its digits is 17496, while the sum is 37.

The square root of 3321916921 is about 57636.0730879542. The cubic root of 3321916921 is about 1492.0942460537.

The spelling of 3321916921 in words is "three billion, three hundred twenty-one million, nine hundred sixteen thousand, nine hundred twenty-one".