21063952 has 160 divisors (see below), whose sum is σ = 56996352. Its totient is φ = 7299072.

The previous prime is 21063907. The next prime is 21063983. The reversal of 21063952 is 25936012.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21063952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 569278 + ... + 569314.

Almost surely, 2^21063952 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 21063952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28498176).

21063952 is an abundant number, since it is smaller than the sum of its proper divisors (35932400).

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

21063952 is a wasteful number, since it uses less digits than its factorization.

21063952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 21063952 is about 4589.5481259052. The cubic root of 21063952 is about 276.1721952832.

Adding to 21063952 its reverse (25936012), we get a palindrome (46999964).

The spelling of 21063952 in words is "twenty-one million, sixty-three thousand, nine hundred fifty-two".