21101847967 has 2 divisors, whose sum is σ = 21101847968. Its totient is φ = 21101847966.

The previous prime is 21101847959. The next prime is 21101847997. The reversal of 21101847967 is 76974810112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101847967 - 2³ = 21101847959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101847937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550923983 + 10550923984.

It is an arithmetic number, because the mean of its divisors is an integer number (10550923984).

Almost surely, 2^21101847967 is an apocalyptic number.

21101847967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101847967 is an equidigital number, since it uses as much as digits as its factorization.

21101847967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 21101847967 in words is "twenty-one billion, one hundred one million, eight hundred forty-seven thousand, nine hundred sixty-seven".