21210202220123 has 8 divisors (see below), whose sum is σ = 24282832573920. Its totient is φ = 18148222232640.

The previous prime is 21210202220117. The next prime is 21210202220131. The reversal of 21210202220123 is 32102220201212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210202220123 - 2⁸ = 21210202219867 is a prime.

It is a super-2 number, since 2×21210202220123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210202220095 and 21210202220104.

It is not an unprimeable number, because it can be changed into a prime (21210202220143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2662587308 + ... + 2662595273.

It is an arithmetic number, because the mean of its divisors is an integer number (3035354071740).

Almost surely, 2^{21210202220123} is an apocalyptic number.

21210202220123 is a deficient number, since it is larger than the sum of its proper divisors (3072630353797).

21210202220123 is an equidigital number, since it uses as much as digits as its factorization.

21210202220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5325183157.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21210202220123 its reverse (32102220201212), we get a palindrome (53312422421335).

The spelling of 21210202220123 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, two hundred twenty thousand, one hundred twenty-three".