21019019167 has 2 divisors, whose sum is σ = 21019019168. Its totient is φ = 21019019166.

The previous prime is 21019019159. The next prime is 21019019209. The reversal of 21019019167 is 76191091012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21019019167 - 2³ = 21019019159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21019019267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10509509583 + 10509509584.

It is an arithmetic number, because the mean of its divisors is an integer number (10509509584).

Almost surely, 2^21019019167 is an apocalyptic number.

21019019167 is a deficient number, since it is larger than the sum of its proper divisors (1).

21019019167 is an equidigital number, since it uses as much as digits as its factorization.

21019019167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 37.

The spelling of 21019019167 in words is "twenty-one billion, nineteen million, nineteen thousand, one hundred sixty-seven".