21121101201212 has 24 divisors (see below), whose sum is σ = 37514165289216. Its totient is φ = 10402773031728.

The previous prime is 21121101201191. The next prime is 21121101201281. The reversal of 21121101201212 is 21210210112112.

It is a super-2 number, since 2×21121101201212² (a number of 27 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 7 ways as a sum of consecutive naturals, for example, 18258623 + ... + 19380905.

It is an arithmetic number, because the mean of its divisors is an integer number (1563090220384).

Almost surely, 2^{21121101201212} is an apocalyptic number.

It is an amenable number.

21121101201212 is a deficient number, since it is larger than the sum of its proper divisors (16393064088004).

21121101201212 is a wasteful number, since it uses less digits than its factorization.

21121101201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192577 (or 1192575 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121101201212 its reverse (21210210112112), we get a palindrome (42331311313324).

The spelling of 21121101201212 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one million, two hundred one thousand, two hundred twelve".