21121202201212 has 12 divisors (see below), whose sum is σ = 36962643586176. Its totient is φ = 10560446890880.

The previous prime is 21121202201201. The next prime is 21121202201243. The reversal of 21121202201212 is 21210220212112.

It is a super-2 number, since 2×21121202201212² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121202201212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38243989 + ... + 38792332.

It is an arithmetic number, because the mean of its divisors is an integer number (3080220298848).

Almost surely, 2^{21121202201212} is an apocalyptic number.

It is an amenable number.

21121202201212 is a deficient number, since it is larger than the sum of its proper divisors (15841441384964).

21121202201212 is a wasteful number, since it uses less digits than its factorization.

21121202201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77104868 (or 77104866 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21121202201212 its reverse (21210220212112), we get a palindrome (42331422413324).

The spelling of 21121202201212 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred two million, two hundred one thousand, two hundred twelve".