21063064 has 32 divisors (see below), whose sum is σ = 44254800. Its totient is φ = 9313920.

The previous prime is 21063061. The next prime is 21063071. The reversal of 21063064 is 46036012.

21063064 = T₉₆ + T₉₇ + ... + T₅₀₂.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22 + ... + 6490.

Almost surely, 2^21063064 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 21063064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22127400).

21063064 is an abundant number, since it is smaller than the sum of its proper divisors (23191736).

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

21063064 is a wasteful number, since it uses less digits than its factorization.

21063064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6523 (or 6519 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21063064 is about 4589.4513833355. The cubic root of 21063064 is about 276.1683143345.

Adding to 21063064 its reverse (46036012), we get a palindrome (67099076).

The spelling of 21063064 in words is "twenty-one million, sixty-three thousand, sixty-four".