21421112 has 8 divisors (see below), whose sum is σ = 40164600. Its totient is φ = 10710552.

The previous prime is 21421097. The next prime is 21421117. The reversal of 21421112 is 21112412.

It is a happy number.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1338812 + ... + 1338827.

It is an arithmetic number, because the mean of its divisors is an integer number (5020575).

Almost surely, 2^21421112 is an apocalyptic number.

It is an amenable number.

21421112 is a deficient number, since it is larger than the sum of its proper divisors (18743488).

21421112 is a wasteful number, since it uses less digits than its factorization.

21421112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677645 (or 2677641 counting only the distinct ones).

The product of its digits is 32, while the sum is 14.

The square root of 21421112 is about 4628.2947183601. The cubic root of 21421112 is about 277.7243787606.

Adding to 21421112 its reverse (21112412), we get a palindrome (42533524).

The spelling of 21421112 in words is "twenty-one million, four hundred twenty-one thousand, one hundred twelve".