121212221220212 has 24 divisors (see below), whose sum is σ = 213951632967072. Its totient is φ = 60084096644000.

The previous prime is 121212221220173. The next prime is 121212221220217. The reversal of 121212221220212 is 212022122212121.

It is a super-2 number, since 2×121212221220212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212221220217) 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, 113645414 + ... + 114707037.

It is an arithmetic number, because the mean of its divisors is an integer number (8914651373628).

Almost surely, 2^{121212221220212} is an apocalyptic number.

It is an amenable number.

121212221220212 is a deficient number, since it is larger than the sum of its proper divisors (92739411746860).

121212221220212 is a wasteful number, since it uses less digits than its factorization.

121212221220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228353599 (or 228353597 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 121212221220212 its reverse (212022122212121), we get a palindrome (333234343432333).

The spelling of 121212221220212 in words is "one hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twelve".