901022021209 has 2 divisors, whose sum is σ = 901022021210. Its totient is φ = 901022021208.

The previous prime is 901022021183. The next prime is 901022021257. The reversal of 901022021209 is 902120220109.

901022021209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 865951219225 + 35070801984 = 930565^2 + 187272^2 .

It is a cyclic number.

It is not a de Polignac number, because 901022021209 - 2⁵ = 901022021177 is a prime.

It is not a weakly prime, because it can be changed into another prime (901022021269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450511010604 + 450511010605.

It is an arithmetic number, because the mean of its divisors is an integer number (450511010605).

Almost surely, 2^901022021209 is an apocalyptic number.

It is an amenable number.

901022021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

901022021209 is an equidigital number, since it uses as much as digits as its factorization.

901022021209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 901022021209 in words is "nine hundred one billion, twenty-two million, twenty-one thousand, two hundred nine".