21210202112223 has 16 divisors (see below), whose sum is σ = 28315180519776. Its totient is φ = 14122687488000.

The previous prime is 21210202112189. The next prime is 21210202112237. The reversal of 21210202112223 is 32221120201212.

It is not a de Polignac number, because 21210202112223 - 2⁹ = 21210202111711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21210202112223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210202112273) 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, 9255223 + ... + 11317223.

It is an arithmetic number, because the mean of its divisors is an integer number (1769698782486).

Almost surely, 2^{21210202112223} is an apocalyptic number.

21210202112223 is a deficient number, since it is larger than the sum of its proper divisors (7104978407553).

21210202112223 is a wasteful number, since it uses less digits than its factorization.

21210202112223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066234.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21210202112223 its reverse (32221120201212), we get a palindrome (53431322313435).

The spelling of 21210202112223 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, one hundred twelve thousand, two hundred twenty-three".