21021212311223 has 16 divisors (see below), whose sum is σ = 21556816174080. Its totient is φ = 20489338224096.

The previous prime is 21021212311219. The next prime is 21021212311331. The reversal of 21021212311223 is 32211321212012.

It is a cyclic number.

It is not a de Polignac number, because 21021212311223 - 2² = 21021212311219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021212311823) 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, 39650336 + ... + 40177002.

It is an arithmetic number, because the mean of its divisors is an integer number (1347301010880).

Almost surely, 2^{21021212311223} is an apocalyptic number.

21021212311223 is a deficient number, since it is larger than the sum of its proper divisors (535603862857).

21021212311223 is a wasteful number, since it uses less digits than its factorization.

21021212311223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530206.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21021212311223 its reverse (32211321212012), we get a palindrome (53232533523235).

The spelling of 21021212311223 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, three hundred eleven thousand, two hundred twenty-three".