3121223012021 has 32 divisors (see below), whose sum is σ = 3285262396416. Its totient is φ = 2961479232000.

The previous prime is 3121223012009. The next prime is 3121223012057. The reversal of 3121223012021 is 1202103221213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121223012021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3121223011984 and 3121223012002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121223012221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 925353491 + ... + 925356863.

It is an arithmetic number, because the mean of its divisors is an integer number (102664449888).

Almost surely, 2^{3121223012021} is an apocalyptic number.

3121223012021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3121223012021 is a deficient number, since it is larger than the sum of its proper divisors (164039384395).

3121223012021 is a wasteful number, since it uses less digits than its factorization.

3121223012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4893.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 3121223012021 its reverse (1202103221213), we get a palindrome (4323326233234).

The spelling of 3121223012021 in words is "three trillion, one hundred twenty-one billion, two hundred twenty-three million, twelve thousand, twenty-one".