21321214443 has 16 divisors (see below), whose sum is σ = 32440688160. Its totient is φ = 13829976288.

The previous prime is 21321214403. The next prime is 21321214483. The reversal of 21321214443 is 34441212312.

21321214443 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 1 + 214 + 443 = 666.

It is an interprime number because it is at equal distance from previous prime (21321214403) and next prime (21321214483).

It is not a de Polignac number, because 21321214443 - 2³³ = 12731279851 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21321214403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10670280 + ... + 10672277.

It is an arithmetic number, because the mean of its divisors is an integer number (2027543010).

Almost surely, 2^21321214443 is an apocalyptic number.

21321214443 is a deficient number, since it is larger than the sum of its proper divisors (11119473717).

21321214443 is a wasteful number, since it uses less digits than its factorization.

21321214443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21342603 (or 21342597 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21321214443 its reverse (34441212312), we get a palindrome (55762426755).

The spelling of 21321214443 in words is "twenty-one billion, three hundred twenty-one million, two hundred fourteen thousand, four hundred forty-three".