3121022021 has 16 divisors (see below), whose sum is σ = 3482450160. Its totient is φ = 2777241600.

The previous prime is 3121022017. The next prime is 3121022029. The reversal of 3121022021 is 1202201213.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 359519521 + 2761502500 = 18961^2 + 52550^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121022021 - 2² = 3121022017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3121021987 and 3121022005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121022029) 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, 247571 + ... + 259871.

It is an arithmetic number, because the mean of its divisors is an integer number (217653135).

Almost surely, 2^3121022021 is an apocalyptic number.

It is an amenable number.

3121022021 is a deficient number, since it is larger than the sum of its proper divisors (361428139).

3121022021 is a wasteful number, since it uses less digits than its factorization.

3121022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13016.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 3121022021 is about 55866.1079814945. The cubic root of 3121022021 is about 1461.3882493635.

Adding to 3121022021 its reverse (1202201213), we get a palindrome (4323223234).

The spelling of 3121022021 in words is "three billion, one hundred twenty-one million, twenty-two thousand, twenty-one".