21012122112 has 40 divisors (see below), whose sum is σ = 55977610656. Its totient is φ = 7004040192.

The previous prime is 21012122101. The next prime is 21012122191. The reversal of 21012122112 is 21122121012.

It is a junction number, because it is equal to n+sod(n) for n = 21012122091 and 21012122100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6838348 + ... + 6841419.

Almost surely, 2^21012122112 is an apocalyptic number.

It is an amenable number.

21012122112 is an abundant number, since it is smaller than the sum of its proper divisors (34965488544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012122112 is an equidigital number, since it uses as much as digits as its factorization.

21012122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13679788 (or 13679772 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21012122112 its reverse (21122121012), we get a palindrome (42134243124).

The spelling of 21012122112 in words is "twenty-one billion, twelve million, one hundred twenty-two thousand, one hundred twelve".