21162391201 has 8 divisors (see below), whose sum is σ = 24370213824. Its totient is φ = 18000724560.

The previous prime is 21162391169. The next prime is 21162391213. The reversal of 21162391201 is 10219326112.

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

It is not a de Polignac number, because 21162391201 - 2⁵ = 21162391169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21162391201.

It is not an unprimeable number, because it can be changed into a prime (21162391001) 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, 11538010 + ... + 11539843.

It is an arithmetic number, because the mean of its divisors is an integer number (3046276728).

Almost surely, 2^21162391201 is an apocalyptic number.

It is an amenable number.

21162391201 is a deficient number, since it is larger than the sum of its proper divisors (3207822623).

21162391201 is a wasteful number, since it uses less digits than its factorization.

21162391201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23077991.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 21162391201 in words is "twenty-one billion, one hundred sixty-two million, three hundred ninety-one thousand, two hundred one".