21212011121011 has 8 divisors (see below), whose sum is σ = 21238902475200. Its totient is φ = 21185122768488.

The previous prime is 21212011120999. The next prime is 21212011121051. The reversal of 21212011121011 is 11012111021212.

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 21212011121011 - 2²⁵ = 21211977566579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212011121051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13564920 + ... + 15047626.

It is an arithmetic number, because the mean of its divisors is an integer number (2654862809400).

Almost surely, 2^{21212011121011} is an apocalyptic number.

21212011121011 is a deficient number, since it is larger than the sum of its proper divisors (26891354189).

21212011121011 is a wasteful number, since it uses less digits than its factorization.

21212011121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500833.

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

Adding to 21212011121011 its reverse (11012111021212), we get a palindrome (32224122142223).

The spelling of 21212011121011 in words is "twenty-one trillion, two hundred twelve billion, eleven million, one hundred twenty-one thousand, eleven".