21062144 has 40 divisors (see below), whose sum is σ = 43473408. Its totient is φ = 10183680.

The previous prime is 21062137. The next prime is 21062159. The reversal of 21062144 is 44126012.

It is a super-2 number, since 2×21062144² = 887227819753472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15209 + ... + 16535.

Almost surely, 2^21062144 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 21062144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21736704).

21062144 is an abundant number, since it is smaller than the sum of its proper divisors (22411264).

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

21062144 is an equidigital number, since it uses as much as digits as its factorization.

21062144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376 (or 1360 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21062144 is about 4589.3511523962. The cubic root of 21062144 is about 276.1642934166.

Adding to 21062144 its reverse (44126012), we get a palindrome (65188156).

The spelling of 21062144 in words is "twenty-one million, sixty-two thousand, one hundred forty-four".