21212233202323 has 4 divisors (see below), whose sum is σ = 21212382234960. Its totient is φ = 21212084169688.

The previous prime is 21212233202299. The next prime is 21212233202357. The reversal of 21212233202323 is 32320233221212.

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 21212233202323 - 2⁹ = 21212233201811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212233202291 and 21212233202300.

It is not an unprimeable number, because it can be changed into a prime (21212233202123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74302615 + ... + 74587552.

It is an arithmetic number, because the mean of its divisors is an integer number (5303095558740).

Almost surely, 2^{21212233202323} is an apocalyptic number.

21212233202323 is a deficient number, since it is larger than the sum of its proper divisors (149032637).

21212233202323 is a wasteful number, since it uses less digits than its factorization.

21212233202323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149032636.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21212233202323 its reverse (32320233221212), we get a palindrome (53532466423535).

The spelling of 21212233202323 in words is "twenty-one trillion, two hundred twelve billion, two hundred thirty-three million, two hundred two thousand, three hundred twenty-three".