4021211209 has 2 divisors, whose sum is σ = 4021211210. Its totient is φ = 4021211208.

The previous prime is 4021211197. The next prime is 4021211219. The reversal of 4021211209 is 9021121204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3072263184 + 948948025 = 55428^2 + 30805^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021211209 - 2²³ = 4012822601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4021211209.

It is not a weakly prime, because it can be changed into another prime (4021211219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010605604 + 2010605605.

It is an arithmetic number, because the mean of its divisors is an integer number (2010605605).

Almost surely, 2^4021211209 is an apocalyptic number.

It is an amenable number.

4021211209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021211209 is an equidigital number, since it uses as much as digits as its factorization.

4021211209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 4021211209 is about 63413.0208159176. The cubic root of 4021211209 is about 1590.2019981225.

The spelling of 4021211209 in words is "four billion, twenty-one million, two hundred eleven thousand, two hundred nine".