202111001921 has 2 divisors, whose sum is σ = 202111001922. Its totient is φ = 202111001920.

The previous prime is 202111001903. The next prime is 202111001923. The reversal of 202111001921 is 129100111202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197900419600 + 4210582321 = 444860^2 + 64889^2 .

It is a cyclic number.

It is not a de Polignac number, because 202111001921 - 2⁶ = 202111001857 is a prime.

Together with 202111001923, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 202111001893 and 202111001902.

It is not a weakly prime, because it can be changed into another prime (202111001923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101055500960 + 101055500961.

It is an arithmetic number, because the mean of its divisors is an integer number (101055500961).

Almost surely, 2^202111001921 is an apocalyptic number.

It is an amenable number.

202111001921 is a deficient number, since it is larger than the sum of its proper divisors (1).

202111001921 is an equidigital number, since it uses as much as digits as its factorization.

202111001921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 202111001921 in words is "two hundred two billion, one hundred eleven million, one thousand, nine hundred twenty-one".