3120200021 has 2 divisors, whose sum is σ = 3120200022. Its totient is φ = 3120200020.

The previous prime is 3120200011. The next prime is 3120200023. The reversal of 3120200021 is 1200020213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2385247921 + 734952100 = 48839^2 + 27110^2 .

It is a cyclic number.

It is not a de Polignac number, because 3120200021 - 2²⁶ = 3053091157 is a prime.

Together with 3120200023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3120199975 and 3120200011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3120200023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560100010 + 1560100011.

It is an arithmetic number, because the mean of its divisors is an integer number (1560100011).

Almost surely, 2^3120200021 is an apocalyptic number.

It is an amenable number.

3120200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3120200021 is an equidigital number, since it uses as much as digits as its factorization.

3120200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 3120200021 is about 55858.7506215454. The cubic root of 3120200021 is about 1461.2599402595.

Adding to 3120200021 its reverse (1200020213), we get a palindrome (4320220234).

The spelling of 3120200021 in words is "three billion, one hundred twenty million, two hundred thousand, twenty-one".