21435912 has 96 divisors (see below), whose sum is σ = 62506080. Its totient is φ = 6612480.

The previous prime is 21435899. The next prime is 21435919. The reversal of 21435912 is 21953412.

It is a plaindrome in base 11.

It is a zygodrome in base 3 and base 11.

It is not an unprimeable number, because it can be changed into a prime (21435919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101487 + ... + 101697.

It is an arithmetic number, because the mean of its divisors is an integer number (651105).

Almost surely, 2^21435912 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 21435912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31253040).

21435912 is an abundant number, since it is smaller than the sum of its proper divisors (41070168).

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

21435912 is a wasteful number, since it uses less digits than its factorization.

21435912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 316 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21435912 is about 4629.8933033062. The cubic root of 21435912 is about 277.7883246247.

The spelling of 21435912 in words is "twenty-one million, four hundred thirty-five thousand, nine hundred twelve".