3121010221 has 4 divisors (see below), whose sum is σ = 3566868832. Its totient is φ = 2675151612.

The previous prime is 3121010203. The next prime is 3121010227. The reversal of 3121010221 is 1220101213.

3121010221 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, and also an emirpimes, since its reverse is a distinct semiprime: 1220101213 = 24137 ⋅50549.

It is not a de Polignac number, because 3121010221 - 2¹³ = 3121002029 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 (3121010227) 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, 222929295 + ... + 222929308.

It is an arithmetic number, because the mean of its divisors is an integer number (891717208).

Almost surely, 2^3121010221 is an apocalyptic number.

It is an amenable number.

3121010221 is a deficient number, since it is larger than the sum of its proper divisors (445858611).

3121010221 is an equidigital number, since it uses as much as digits as its factorization.

3121010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445858610.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 3121010221 is about 55866.0023717466. The cubic root of 3121010221 is about 1461.3864076160.

Adding to 3121010221 its reverse (1220101213), we get a palindrome (4341111434).

The spelling of 3121010221 in words is "three billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".