21602412 has 72 divisors (see below), whose sum is σ = 60744320. Its totient is φ = 6428160.

The previous prime is 21602401. The next prime is 21602417. The reversal of 21602412 is 21420612.

21602412 is a `hidden beast` number, since 21 + 602 + 41 + 2 = 666.

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

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (21602417) 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, 13764 + ... + 15252.

Almost surely, 2^21602412 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 21602412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30372160).

21602412 is an abundant number, since it is smaller than the sum of its proper divisors (39141908).

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

21602412 is a wasteful number, since it uses less digits than its factorization.

21602412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543 (or 1538 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21602412 is about 4647.8394980894. The cubic root of 21602412 is about 278.5056958460.

The spelling of 21602412 in words is "twenty-one million, six hundred two thousand, four hundred twelve".