21121032111 has 16 divisors (see below), whose sum is σ = 30049635840. Its totient is φ = 13156862400.

The previous prime is 21121032091. The next prime is 21121032113. The reversal of 21121032111 is 11123012112.

It is not a de Polignac number, because 21121032111 - 2⁷ = 21121031983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121032113) 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 15 ways as a sum of consecutive naturals, for example, 2533815 + ... + 2542136.

It is an arithmetic number, because the mean of its divisors is an integer number (1878102240).

Almost surely, 2^21121032111 is an apocalyptic number.

21121032111 is a deficient number, since it is larger than the sum of its proper divisors (8928603729).

21121032111 is a wasteful number, since it uses less digits than its factorization.

21121032111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5076046.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21121032111 its reverse (11123012112), we get a palindrome (32244044223).

The spelling of 21121032111 in words is "twenty-one billion, one hundred twenty-one million, thirty-two thousand, one hundred eleven".