121221100221212 has 12 divisors (see below), whose sum is σ = 218980052012736. Its totient is φ = 58655371074720.

The previous prime is 121221100221191. The next prime is 121221100221223. The reversal of 121221100221212 is 212122001122121.

It is a super-2 number, since 2×121221100221212² (a number of 29 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 488794758833 + ... + 488794759080.

It is an arithmetic number, because the mean of its divisors is an integer number (18248337667728).

Almost surely, 2^{121221100221212} is an apocalyptic number.

It is an amenable number.

121221100221212 is a deficient number, since it is larger than the sum of its proper divisors (97758951791524).

121221100221212 is a wasteful number, since it uses less digits than its factorization.

121221100221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977589517948 (or 977589517946 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121221100221212 its reverse (212122001122121), we get a palindrome (333343101343333).

Subtracting 121221100221212 from its reverse (212122001122121), we obtain a palindrome (90900900900909).

The spelling of 121221100221212 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, two hundred twenty-one thousand, two hundred twelve".