21321011112 has 32 divisors (see below), whose sum is σ = 55021966080. Its totient is φ = 6877745280.

The previous prime is 21321011053. The next prime is 21321011119. The reversal of 21321011112 is 21111012312.

It is a junction number, because it is equal to n+sod(n) for n = 21321011091 and 21321011100.

It is not an unprimeable number, because it can be changed into a prime (21321011119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14327893 + ... + 14329380.

It is an arithmetic number, because the mean of its divisors is an integer number (1719436440).

Almost surely, 2^21321011112 is an apocalyptic number.

It is an amenable number.

21321011112 is an abundant number, since it is smaller than the sum of its proper divisors (33700954968).

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

21321011112 is a wasteful number, since it uses less digits than its factorization.

21321011112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28657313 (or 28657309 counting only the distinct ones).

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

Adding to 21321011112 its reverse (21111012312), we get a palindrome (42432023424).

The spelling of 21321011112 in words is "twenty-one billion, three hundred twenty-one million, eleven thousand, one hundred twelve".