21111022121011 has 8 divisors (see below), whose sum is σ = 21792202360704. Its totient is φ = 20429853101760.

The previous prime is 21111022120997. The next prime is 21111022121017. The reversal of 21111022121011 is 11012122011112.

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 21111022121011 - 2⁹ = 21111022120499 is a prime.

It is a super-2 number, since 2×21111022121011² (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 (21111022121017) 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, 1105095 + ... + 6591151.

It is an arithmetic number, because the mean of its divisors is an integer number (2724025295088).

Almost surely, 2^{21111022121011} is an apocalyptic number.

21111022121011 is a deficient number, since it is larger than the sum of its proper divisors (681180239693).

21111022121011 is a wasteful number, since it uses less digits than its factorization.

21111022121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5610221.

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

Adding to 21111022121011 its reverse (11012122011112), we get a palindrome (32123144132123).

The spelling of 21111022121011 in words is "twenty-one trillion, one hundred eleven billion, twenty-two million, one hundred twenty-one thousand, eleven".