3121522043021 has 4 divisors (see below), whose sum is σ = 3122361391200. Its totient is φ = 3120682694844.

The previous prime is 3121522043009. The next prime is 3121522043083. The reversal of 3121522043021 is 1203402251213.

3121522043021 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121522043021 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 (3121522013021) 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, 419668511 + ... + 419675948.

It is an arithmetic number, because the mean of its divisors is an integer number (780590347800).

Almost surely, 2^{3121522043021} is an apocalyptic number.

It is an amenable number.

3121522043021 is a deficient number, since it is larger than the sum of its proper divisors (839348179).

3121522043021 is an equidigital number, since it uses as much as digits as its factorization.

3121522043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839348178.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 3121522043021 its reverse (1203402251213), we get a palindrome (4324924294234).

The spelling of 3121522043021 in words is "three trillion, one hundred twenty-one billion, five hundred twenty-two million, forty-three thousand, twenty-one".