212221002123 has 96 divisors (see below), whose sum is σ = 341137899648. Its totient is φ = 126301593600.

The previous prime is 212221002109. The next prime is 212221002127. The reversal of 212221002123 is 321200122212.

It is not a de Polignac number, because 212221002123 - 2¹⁰ = 212221001099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212221002096 and 212221002105.

It is not an unprimeable number, because it can be changed into a prime (212221002127) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 421910290 + ... + 421910792.

It is an arithmetic number, because the mean of its divisors is an integer number (3553519788).

Almost surely, 2^212221002123 is an apocalyptic number.

212221002123 is a deficient number, since it is larger than the sum of its proper divisors (128916897525).

212221002123 is a wasteful number, since it uses less digits than its factorization.

212221002123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157 (or 1154 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 212221002123 its reverse (321200122212), we get a palindrome (533421124335).

The spelling of 212221002123 in words is "two hundred twelve billion, two hundred twenty-one million, two thousand, one hundred twenty-three".