201221970049 has 2 divisors, whose sum is σ = 201221970050. Its totient is φ = 201221970048.

The previous prime is 201221970029. The next prime is 201221970071. The reversal of 201221970049 is 940079122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198565598449 + 2656371600 = 445607^2 + 51540^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221970049 - 2²³ = 201213581441 is a prime.

It is not a weakly prime, because it can be changed into another prime (201221970029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610985024 + 100610985025.

It is an arithmetic number, because the mean of its divisors is an integer number (100610985025).

Almost surely, 2^201221970049 is an apocalyptic number.

It is an amenable number.

201221970049 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221970049 is an equidigital number, since it uses as much as digits as its factorization.

201221970049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 201221970049 in words is "two hundred one billion, two hundred twenty-one million, nine hundred seventy thousand, forty-nine".