21053435191 has 2 divisors, whose sum is σ = 21053435192. Its totient is φ = 21053435190.

The previous prime is 21053435189. The next prime is 21053435281. The reversal of 21053435191 is 19153435012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21053435191 - 2¹ = 21053435189 is a prime.

Together with 21053435189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21053435111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526717595 + 10526717596.

It is an arithmetic number, because the mean of its divisors is an integer number (10526717596).

Almost surely, 2^21053435191 is an apocalyptic number.

21053435191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21053435191 is an equidigital number, since it uses as much as digits as its factorization.

21053435191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 21053435191 in words is "twenty-one billion, fifty-three million, four hundred thirty-five thousand, one hundred ninety-one".