21201112122223 has 16 divisors (see below), whose sum is σ = 23320000016640. Its totient is φ = 19273432858680.

The previous prime is 21201112122217. The next prime is 21201112122257. The reversal of 21201112122223 is 32222121110212.

It is not a de Polignac number, because 21201112122223 - 2⁹ = 21201112121711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201112122194 and 21201112122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201112122263) 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, 166586908 + ... + 166714126.

It is an arithmetic number, because the mean of its divisors is an integer number (1457500001040).

Almost surely, 2^{21201112122223} is an apocalyptic number.

21201112122223 is a deficient number, since it is larger than the sum of its proper divisors (2118887894417).

21201112122223 is a wasteful number, since it uses less digits than its factorization.

21201112122223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252459 (or 252437 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21201112122223 its reverse (32222121110212), we get a palindrome (53423233232435).

The spelling of 21201112122223 in words is "twenty-one trillion, two hundred one billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty-three".