21210362511223 has 4 divisors (see below), whose sum is σ = 22132552185648. Its totient is φ = 20288172836800.

The previous prime is 21210362511139. The next prime is 21210362511263. The reversal of 21210362511223 is 32211526301212.

It is a happy number.

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 21210362511223 - 2²¹ = 21210360414071 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 (21210362511263) 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, 461094837178 + ... + 461094837223.

It is an arithmetic number, because the mean of its divisors is an integer number (5533138046412).

Almost surely, 2^{21210362511223} is an apocalyptic number.

21210362511223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21210362511223 is a deficient number, since it is larger than the sum of its proper divisors (922189674425).

21210362511223 is an equidigital number, since it uses as much as digits as its factorization.

21210362511223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922189674424.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 21210362511223 its reverse (32211526301212), we get a palindrome (53421888812435).

The spelling of 21210362511223 in words is "twenty-one trillion, two hundred ten billion, three hundred sixty-two million, five hundred eleven thousand, two hundred twenty-three".