21222121210212 has 24 divisors (see below), whose sum is σ = 53327381502976. Its totient is φ = 6529883449248.

The previous prime is 21222121210189. The next prime is 21222121210229. The reversal of 21222121210212 is 21201212122212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68019619108 + ... + 68019619419.

Almost surely, 2^{21222121210212} is an apocalyptic number.

It is an amenable number.

21222121210212 is an abundant number, since it is smaller than the sum of its proper divisors (32105260292764).

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

21222121210212 is a wasteful number, since it uses less digits than its factorization.

21222121210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136039238547 (or 136039238545 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222121210212 its reverse (21201212122212), we get a palindrome (42423333332424).

The spelling of 21222121210212 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred ten thousand, two hundred twelve".