21010162791 has 8 divisors (see below), whose sum is σ = 28665028480. Its totient is φ = 13681036152.

The previous prime is 21010162763. The next prime is 21010162813. The reversal of 21010162791 is 19726101012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21010162791 - 2²⁷ = 20875945063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010162721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81434611 + ... + 81434868.

It is an arithmetic number, because the mean of its divisors is an integer number (3583128560).

Almost surely, 2^21010162791 is an apocalyptic number.

21010162791 is a deficient number, since it is larger than the sum of its proper divisors (7654865689).

21010162791 is a wasteful number, since it uses less digits than its factorization.

21010162791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162869525.

The product of its (nonzero) digits is 1512, while the sum is 30.

The spelling of 21010162791 in words is "twenty-one billion, ten million, one hundred sixty-two thousand, seven hundred ninety-one".