21212000202011 has 4 divisors (see below), whose sum is σ = 21399717018072. Its totient is φ = 21024283385952.

The previous prime is 21212000201999. The next prime is 21212000202017. The reversal of 21212000202011 is 11020200021212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21212000202011 - 2³⁰ = 21210926460187 is a prime.

It is a super-2 number, since 2×21212000202011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212000202017) 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, 93858407861 + ... + 93858408086.

It is an arithmetic number, because the mean of its divisors is an integer number (5349929254518).

Almost surely, 2^{21212000202011} is an apocalyptic number.

21212000202011 is a deficient number, since it is larger than the sum of its proper divisors (187716816061).

21212000202011 is a wasteful number, since it uses less digits than its factorization.

21212000202011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187716816060.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21212000202011 its reverse (11020200021212), we get a palindrome (32232200223223).

The spelling of 21212000202011 in words is "twenty-one trillion, two hundred twelve billion, two hundred two thousand, eleven".