3121220343 has 4 divisors (see below), whose sum is σ = 4161627128. Its totient is φ = 2080813560.

The previous prime is 3121220329. The next prime is 3121220363. The reversal of 3121220343 is 3430221213.

3121220343 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3121220343 - 2⁴ = 3121220327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121220303) 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, 520203388 + ... + 520203393.

It is an arithmetic number, because the mean of its divisors is an integer number (1040406782).

Almost surely, 2^3121220343 is an apocalyptic number.

3121220343 is a deficient number, since it is larger than the sum of its proper divisors (1040406785).

3121220343 is a wasteful number, since it uses less digits than its factorization.

3121220343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040406784.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 3121220343 is about 55867.8829292824. The cubic root of 3121220343 is about 1461.4192028246.

Adding to 3121220343 its reverse (3430221213), we get a palindrome (6551441556).

The spelling of 3121220343 in words is "three billion, one hundred twenty-one million, two hundred twenty thousand, three hundred forty-three".