201021022109 has 2 divisors, whose sum is σ = 201021022110. Its totient is φ = 201021022108.

The previous prime is 201021022093. The next prime is 201021022129. The reversal of 201021022109 is 901220120102.

It is a happy number.

It is an a-pointer prime, because the next prime (201021022129) can be obtained adding 201021022109 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192723634009 + 8297388100 = 439003^2 + 91090^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021022109 - 2⁴ = 201021022093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201021022129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510511054 + 100510511055.

It is an arithmetic number, because the mean of its divisors is an integer number (100510511055).

Almost surely, 2^201021022109 is an apocalyptic number.

It is an amenable number.

201021022109 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021022109 is an equidigital number, since it uses as much as digits as its factorization.

201021022109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 201021022109 in words is "two hundred one billion, twenty-one million, twenty-two thousand, one hundred nine".