3121252821 has 24 divisors (see below), whose sum is σ = 4579791840. Its totient is φ = 2047975776.

The previous prime is 3121252811. The next prime is 3121252837. The reversal of 3121252821 is 1282521213.

It is not a de Polignac number, because 3121252821 - 2¹³ = 3121244629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121252811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1333270 + ... + 1335608.

It is an arithmetic number, because the mean of its divisors is an integer number (190824660).

Almost surely, 2^3121252821 is an apocalyptic number.

It is an amenable number.

3121252821 is a deficient number, since it is larger than the sum of its proper divisors (1458539019).

3121252821 is a wasteful number, since it uses less digits than its factorization.

3121252821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4625 (or 4622 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 3121252821 is about 55868.1735964225. The cubic root of 3121252821 is about 1461.4242717617.

The spelling of 3121252821 in words is "three billion, one hundred twenty-one million, two hundred fifty-two thousand, eight hundred twenty-one".