3121020101221 has 16 divisors (see below), whose sum is σ = 3451242297600. Its totient is φ = 2798755624000.

The previous prime is 3121020101219. The next prime is 3121020101233. The reversal of 3121020101221 is 1221010201213.

It is not a de Polignac number, because 3121020101221 - 2¹ = 3121020101219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3121020101195 and 3121020101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121020101201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4922701 + ... + 5520418.

It is an arithmetic number, because the mean of its divisors is an integer number (215702643600).

Almost surely, 2^{3121020101221} is an apocalyptic number.

It is an amenable number.

3121020101221 is a deficient number, since it is larger than the sum of its proper divisors (330222196379).

3121020101221 is a wasteful number, since it uses less digits than its factorization.

3121020101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10443500.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 3121020101221 its reverse (1221010201213), we get a palindrome (4342030302434).

The spelling of 3121020101221 in words is "three trillion, one hundred twenty-one billion, twenty million, one hundred one thousand, two hundred twenty-one".