21212002222012 has 24 divisors (see below), whose sum is σ = 42593024396160. Its totient is φ = 9054639534000.

The previous prime is 21212002222003. The next prime is 21212002222027. The reversal of 21212002222012 is 21022220021212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1509099562 + ... + 1509113617.

It is an arithmetic number, because the mean of its divisors is an integer number (1774709349840).

Almost surely, 2^{21212002222012} is an apocalyptic number.

It is an amenable number.

21212002222012 is an abundant number, since it is smaller than the sum of its proper divisors (21381022174148).

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

21212002222012 is a wasteful number, since it uses less digits than its factorization.

21212002222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018213441 (or 3018213439 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21212002222012 its reverse (21022220021212), we get a palindrome (42234222243224).

The spelling of 21212002222012 in words is "twenty-one trillion, two hundred twelve billion, two million, two hundred twenty-two thousand, twelve".