21214206323 has 4 divisors (see below), whose sum is σ = 21214577640. Its totient is φ = 21213835008.

The previous prime is 21214206319. The next prime is 21214206337. The reversal of 21214206323 is 32360241212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21214206323 - 2² = 21214206319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21214206292 and 21214206301.

It is not an unprimeable number, because it can be changed into a prime (21214206023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79865 + ... + 220922.

It is an arithmetic number, because the mean of its divisors is an integer number (5303644410).

Almost surely, 2^21214206323 is an apocalyptic number.

21214206323 is a deficient number, since it is larger than the sum of its proper divisors (371317).

21214206323 is an equidigital number, since it uses as much as digits as its factorization.

21214206323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371316.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21214206323 its reverse (32360241212), we get a palindrome (53574447535).

The spelling of 21214206323 in words is "twenty-one billion, two hundred fourteen million, two hundred six thousand, three hundred twenty-three".