21105161023619 has 4 divisors (see below), whose sum is σ = 21105179166096. Its totient is φ = 21105142881144.

The previous prime is 21105161023601. The next prime is 21105161023657. The reversal of 21105161023619 is 91632016150112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21105161023619 - 2³² = 21100866056323 is a prime.

It is a super-2 number, since 2×21105161023619² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21105161029619) 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 in 3 ways as a sum of consecutive naturals, for example, 7197239 + ... + 9695904.

It is an arithmetic number, because the mean of its divisors is an integer number (5276294791524).

Almost surely, 2^{21105161023619} is an apocalyptic number.

21105161023619 is a deficient number, since it is larger than the sum of its proper divisors (18142477).

21105161023619 is a wasteful number, since it uses less digits than its factorization.

21105161023619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18142476.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 21105161023619 in words is "twenty-one trillion, one hundred five billion, one hundred sixty-one million, twenty-three thousand, six hundred nineteen".