3031200000021 has 4 divisors (see below), whose sum is σ = 4041600000032. Its totient is φ = 2020800000012.

The previous prime is 3031199999969. The next prime is 3031200000029. The reversal of 3031200000021 is 1200000021303.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3031200000021 - 2¹⁰ = 3031199998997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3031199999952 and 3031200000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3031200000029) 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 3 ways as a sum of consecutive naturals, for example, 505200000001 + ... + 505200000006.

It is an arithmetic number, because the mean of its divisors is an integer number (1010400000008).

Almost surely, 2^{3031200000021} is an apocalyptic number.

It is an amenable number.

3031200000021 is a deficient number, since it is larger than the sum of its proper divisors (1010400000011).

3031200000021 is a wasteful number, since it uses less digits than its factorization.

3031200000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010400000010.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 3031200000021 its reverse (1200000021303), we get a palindrome (4231200021324).

It can be divided in two parts, 303 and 1200000021, that multiplied together give a palindrome (363600006363).

The spelling of 3031200000021 in words is "three trillion, thirty-one billion, two hundred million, twenty-one", and thus it is an aban number.