21112012101 has 16 divisors (see below), whose sum is σ = 28236257280. Its totient is φ = 14031257280.

The previous prime is 21112012069. The next prime is 21112012147. The reversal of 21112012101 is 10121021112.

It is not a de Polignac number, because 21112012101 - 2⁵ = 21112012069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112092101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4066015 + ... + 4071203.

It is an arithmetic number, because the mean of its divisors is an integer number (1764766080).

Almost surely, 2^21112012101 is an apocalyptic number.

It is an amenable number.

21112012101 is a deficient number, since it is larger than the sum of its proper divisors (7124245179).

21112012101 is a wasteful number, since it uses less digits than its factorization.

21112012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9116.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21112012101 its reverse (10121021112), we get a palindrome (31233033213).

The spelling of 21112012101 in words is "twenty-one billion, one hundred twelve million, twelve thousand, one hundred one".