21121210212208 has 20 divisors (see below), whose sum is σ = 40976119244448. Its totient is φ = 10546727826560.

The previous prime is 21121210212197. The next prime is 21121210212209. The reversal of 21121210212208 is 80221201212112.

It is a super-2 number, since 2×21121210212208² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121210212209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 867317416 + ... + 867341767.

Almost surely, 2^{21121210212208} is an apocalyptic number.

It is an amenable number.

21121210212208 is a deficient number, since it is larger than the sum of its proper divisors (19854909032240).

21121210212208 is a wasteful number, since it uses less digits than its factorization.

21121210212208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734659952 (or 1734659946 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The spelling of 21121210212208 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, two hundred twelve thousand, two hundred eight".