21214523191 has 8 divisors (see below), whose sum is σ = 21495116160. Its totient is φ = 20935758648.

The previous prime is 21214523173. The next prime is 21214523201. The reversal of 21214523191 is 19132541212.

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

It is a cyclic number.

It is not a de Polignac number, because 21214523191 - 2¹⁷ = 21214392119 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 (21214523101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433741 + ... + 480166.

It is an arithmetic number, because the mean of its divisors is an integer number (2686889520).

Almost surely, 2^21214523191 is an apocalyptic number.

21214523191 is a deficient number, since it is larger than the sum of its proper divisors (280592969).

21214523191 is a wasteful number, since it uses less digits than its factorization.

21214523191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914213.

The product of its digits is 4320, while the sum is 31.

The spelling of 21214523191 in words is "twenty-one billion, two hundred fourteen million, five hundred twenty-three thousand, one hundred ninety-one".