21216212432343 has 24 divisors (see below), whose sum is σ = 32260181690880. Its totient is φ = 13399043066640.

The previous prime is 21216212432339. The next prime is 21216212432347. The reversal of 21216212432343 is 34323421261212.

21216212432343 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 6 + 212 + 432 + 3 + 4 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21216212432339) and next prime (21216212432347).

It is not a de Polignac number, because 21216212432343 - 2² = 21216212432339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21216212432298 and 21216212432307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216212432347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 338728 + ... + 6522818.

It is an arithmetic number, because the mean of its divisors is an integer number (1344174237120).

Almost surely, 2^{21216212432343} is an apocalyptic number.

21216212432343 is a deficient number, since it is larger than the sum of its proper divisors (11043969258537).

21216212432343 is a wasteful number, since it uses less digits than its factorization.

21216212432343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6204179 (or 6204176 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

Adding to 21216212432343 its reverse (34323421261212), we get a palindrome (55539633693555).

The spelling of 21216212432343 in words is "twenty-one trillion, two hundred sixteen billion, two hundred twelve million, four hundred thirty-two thousand, three hundred forty-three".