3120001021 has 2 divisors, whose sum is σ = 3120001022. Its totient is φ = 3120001020.

The previous prime is 3120001013. The next prime is 3120001043. The reversal of 3120001021 is 1201000213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117012121 + 1002988900 = 46011^2 + 31670^2 .

It is a cyclic number.

It is not a de Polignac number, because 3120001021 - 2³ = 3120001013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3120000989 and 3120001007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3120001921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560000510 + 1560000511.

It is an arithmetic number, because the mean of its divisors is an integer number (1560000511).

Almost surely, 2^3120001021 is an apocalyptic number.

It is an amenable number.

3120001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3120001021 is an equidigital number, since it uses as much as digits as its factorization.

3120001021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 3120001021 is about 55856.9693144911. The cubic root of 3120001021 is about 1461.2288742051.

Adding to 3120001021 its reverse (1201000213), we get a palindrome (4321001234).

The spelling of 3120001021 in words is "three billion, one hundred twenty million, one thousand, twenty-one".