21464336 has 80 divisors (see below), whose sum is σ = 47568384. Its totient is φ = 9326592.

The previous prime is 21464323. The next prime is 21464347. The reversal of 21464336 is 63346412.

Its product of digits (10368) is a multiple of the sum of its prime divisors (162).

It is a junction number, because it is equal to n+sod(n) for n = 21464299 and 21464308.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293996 + ... + 294068.

Almost surely, 2^21464336 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 21464336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23784192).

21464336 is an abundant number, since it is smaller than the sum of its proper divisors (26104048).

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

21464336 is a wasteful number, since it uses less digits than its factorization.

21464336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 162 counting only the distinct ones).

The product of its digits is 10368, while the sum is 29.

The square root of 21464336 is about 4632.9619035775. The cubic root of 21464336 is about 277.9110527510.

The spelling of 21464336 in words is "twenty-one million, four hundred sixty-four thousand, three hundred thirty-six".