3621867121 has 2 divisors, whose sum is σ = 3621867122. Its totient is φ = 3621867120.

The previous prime is 3621867107. The next prime is 3621867133. The reversal of 3621867121 is 1217681263.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2075804721 + 1546062400 = 45561^2 + 39320^2 .

It is a cyclic number.

It is not a de Polignac number, because 3621867121 - 2⁷ = 3621866993 is a prime.

It is not a weakly prime, because it can be changed into another prime (3621867181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810933560 + 1810933561.

It is an arithmetic number, because the mean of its divisors is an integer number (1810933561).

Almost surely, 2^3621867121 is an apocalyptic number.

It is an amenable number.

3621867121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3621867121 is an equidigital number, since it uses as much as digits as its factorization.

3621867121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 3621867121 is about 60181.9501262629. The cubic root of 3621867121 is about 1535.7157475082.

The spelling of 3621867121 in words is "three billion, six hundred twenty-one million, eight hundred sixty-seven thousand, one hundred twenty-one".