21111121214 has 16 divisors (see below), whose sum is σ = 32066592768. Its totient is φ = 10422403032.

The previous prime is 21111121211. The next prime is 21111121219. The reversal of 21111121214 is 41212111112.

It is a junction number, because it is equal to n+sod(n) for n = 21111121192 and 21111121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261059 + ... + 332225.

It is an arithmetic number, because the mean of its divisors is an integer number (2004162048).

Almost surely, 2^21111121214 is an apocalyptic number.

21111121214 is a deficient number, since it is larger than the sum of its proper divisors (10955471554).

21111121214 is a wasteful number, since it uses less digits than its factorization.

21111121214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73039.

The product of its digits is 32, while the sum is 17.

Adding to 21111121214 its reverse (41212111112), we get a palindrome (62323232326).

The spelling of 21111121214 in words is "twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, two hundred fourteen".