21212230122 has 24 divisors (see below), whose sum is σ = 46252575876. Its totient is φ = 7025705856.

The previous prime is 21212230099. The next prime is 21212230133. The reversal of 21212230122 is 22103221212.

It can be written as a sum of positive squares in 2 ways, for example, as 20885741361 + 326488761 = 144519^2 + 18069^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21212230095 and 21212230104.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3750223 + ... + 3755874.

Almost surely, 2^21212230122 is an apocalyptic number.

21212230122 is an abundant number, since it is smaller than the sum of its proper divisors (25040345754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212230122 is a wasteful number, since it uses less digits than its factorization.

21212230122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7506262 (or 7506259 counting only the distinct ones).

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

Adding to 21212230122 its reverse (22103221212), we get a palindrome (43315451334).

The spelling of 21212230122 in words is "twenty-one billion, two hundred twelve million, two hundred thirty thousand, one hundred twenty-two".