3124221021 has 12 divisors (see below), whose sum is σ = 4545705372. Its totient is φ = 2067610176.

The previous prime is 3124221017. The next prime is 3124221043. The reversal of 3124221021 is 1201224213.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1523340900 + 1600880121 = 39030^2 + 40011^2 .

It is not a de Polignac number, because 3124221021 - 2² = 3124221017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3124220985 and 3124221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3124231021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1265686 + ... + 1268151.

It is an arithmetic number, because the mean of its divisors is an integer number (378808781).

Almost surely, 2^3124221021 is an apocalyptic number.

It is an amenable number.

3124221021 is a deficient number, since it is larger than the sum of its proper divisors (1421484351).

3124221021 is a wasteful number, since it uses less digits than its factorization.

3124221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533980 (or 2533977 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 3124221021 is about 55894.7316032558. The cubic root of 3124221021 is about 1461.8873790957.

Adding to 3124221021 its reverse (1201224213), we get a palindrome (4325445234).

The spelling of 3124221021 in words is "three billion, one hundred twenty-four million, two hundred twenty-one thousand, twenty-one".