21220012121011 has 32 divisors (see below), whose sum is σ = 23953878660096. Its totient is φ = 18630864000000.

The previous prime is 21220012120997. The next prime is 21220012121041. The reversal of 21220012121011 is 11012121002212.

It is a de Polignac number, because none of the positive numbers 2^k-21220012121011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220012121041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35581795 + ... + 36173251.

It is an arithmetic number, because the mean of its divisors is an integer number (748558708128).

Almost surely, 2^{21220012121011} is an apocalyptic number.

21220012121011 is a deficient number, since it is larger than the sum of its proper divisors (2733866539085).

21220012121011 is a wasteful number, since it uses less digits than its factorization.

21220012121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592363.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220012121011 its reverse (11012121002212), we get a palindrome (32232133123223).

The spelling of 21220012121011 in words is "twenty-one trillion, two hundred twenty billion, twelve million, one hundred twenty-one thousand, eleven".