21407112 has 128 divisors (see below), whose sum is σ = 64512000. Its totient is φ = 6557760.

The previous prime is 21407101. The next prime is 21407117. The reversal of 21407112 is 21170412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21407117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153939 + ... + 154077.

It is an arithmetic number, because the mean of its divisors is an integer number (504000).

Almost surely, 2^21407112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21407112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32256000).

21407112 is an abundant number, since it is smaller than the sum of its proper divisors (43104888).

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

21407112 is a wasteful number, since it uses less digits than its factorization.

21407112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21407112 is about 4626.7820350650. The cubic root of 21407112 is about 277.6638623153.

Adding to 21407112 its reverse (21170412), we get a palindrome (42577524).

The spelling of 21407112 in words is "twenty-one million, four hundred seven thousand, one hundred twelve".