21212011011121 has 8 divisors (see below), whose sum is σ = 24242379793664. Its totient is φ = 18181662602400.

The previous prime is 21212011011089. The next prime is 21212011011151. The reversal of 21212011011121 is 12111011021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212011011121 - 2⁵ = 21212011011089 is a prime.

It is a super-2 number, since 2×21212011011121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212011011095 and 21212011011104.

It is not an unprimeable number, because it can be changed into a prime (21212011011151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2793180 + ... + 7087021.

It is an arithmetic number, because the mean of its divisors is an integer number (3030297474208).

Almost surely, 2^{21212011011121} is an apocalyptic number.

It is an amenable number.

21212011011121 is a deficient number, since it is larger than the sum of its proper divisors (3030368782543).

21212011011121 is an equidigital number, since it uses as much as digits as its factorization.

21212011011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10186911.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21212011011121 its reverse (12111011021212), we get a palindrome (33323022032333).

The spelling of 21212011011121 in words is "twenty-one trillion, two hundred twelve billion, eleven million, eleven thousand, one hundred twenty-one".