21062944 has 96 divisors (see below), whose sum is σ = 51408000. Its totient is φ = 8467200.

The previous prime is 21062927. The next prime is 21062957. The reversal of 21062944 is 44926012.

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

It is a congruent number.

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, 208494 + ... + 208594.

It is an arithmetic number, because the mean of its divisors is an integer number (535500).

Almost surely, 2^21062944 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 21062944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25704000).

21062944 is an abundant number, since it is smaller than the sum of its proper divisors (30345056).

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

21062944 is a wasteful number, since it uses less digits than its factorization.

21062944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 21062944 is about 4589.4383098588. The cubic root of 21062944 is about 276.1677898736.

Adding to 21062944 its reverse (44926012), we get a palindrome (65988956).

It can be divided in two parts, 2106 and 2944, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 21062944 in words is "twenty-one million, sixty-two thousand, nine hundred forty-four".