21470064 has 160 divisors (see below), whose sum is σ = 71471616. Its totient is φ = 5391360.

The previous prime is 21470047. The next prime is 21470069. The reversal of 21470064 is 46007412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136674 + ... + 136830.

Almost surely, 2^21470064 is an apocalyptic number.

21470064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21470064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35735808).

21470064 is an abundant number, since it is smaller than the sum of its proper divisors (50001552).

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

21470064 is a wasteful number, since it uses less digits than its factorization.

21470064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21470064 is about 4633.5800413935. The cubic root of 21470064 is about 277.9357717846.

Adding to 21470064 its reverse (46007412), we get a palindrome (67477476).

The spelling of 21470064 in words is "twenty-one million, four hundred seventy thousand, sixty-four".