3124521621 has 40 divisors (see below), whose sum is σ = 5035143960. Its totient is φ = 1919490048.

The previous prime is 3124521607. The next prime is 3124521643. The reversal of 3124521621 is 1261254213.

3124521621 is a `hidden beast` number, since 3 + 12 + 4 + 5 + 21 + 621 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 64883025 + 3059638596 = 8055^2 + 55314^2 .

It is not a de Polignac number, because 3124521621 - 2⁹ = 3124521109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3124520621) 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 39 ways as a sum of consecutive naturals, for example, 706465 + ... + 710873.

It is an arithmetic number, because the mean of its divisors is an integer number (125878599).

Almost surely, 2^3124521621 is an apocalyptic number.

It is an amenable number.

3124521621 is a deficient number, since it is larger than the sum of its proper divisors (1910622339).

3124521621 is a wasteful number, since it uses less digits than its factorization.

3124521621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5107 (or 5098 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 3124521621 is about 55897.4205218810. The cubic root of 3124521621 is about 1461.9342632364.

Adding to 3124521621 its reverse (1261254213), we get a palindrome (4385775834).

The spelling of 3124521621 in words is "three billion, one hundred twenty-four million, five hundred twenty-one thousand, six hundred twenty-one".