20121021112 has 8 divisors (see below), whose sum is σ = 37726914600. Its totient is φ = 10060510552.

The previous prime is 20121021101. The next prime is 20121021139. The reversal of 20121021112 is 21112012102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20121021092 and 20121021101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257563812 + ... + 1257563827.

It is an arithmetic number, because the mean of its divisors is an integer number (4715864325).

Almost surely, 2^20121021112 is an apocalyptic number.

It is an amenable number.

20121021112 is a deficient number, since it is larger than the sum of its proper divisors (17605893488).

20121021112 is a wasteful number, since it uses less digits than its factorization.

20121021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515127645 (or 2515127641 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121021112 its reverse (21112012102), we get a palindrome (41233033214).

The spelling of 20121021112 in words is "twenty billion, one hundred twenty-one million, twenty-one thousand, one hundred twelve".