21061832 has 32 divisors (see below), whose sum is σ = 43420320. Its totient is φ = 9498240.

The previous prime is 21061819. The next prime is 21061871. The reversal of 21061832 is 23816012.

It is a junction number, because it is equal to n+sod(n) for n = 21061798 and 21061807.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11183 + ... + 12929.

It is an arithmetic number, because the mean of its divisors is an integer number (1356885).

Almost surely, 2^21061832 is an apocalyptic number.

21061832 is a gapful number since it is divisible by the number (22) 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 21061832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21710160).

21061832 is an abundant number, since it is smaller than the sum of its proper divisors (22358488).

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

21061832 is a wasteful number, since it uses less digits than its factorization.

21061832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21061832 is about 4589.3171605371. The cubic root of 21061832 is about 276.1629297744.

Adding to 21061832 its reverse (23816012), we get a palindrome (44877844).

The spelling of 21061832 in words is "twenty-one million, sixty-one thousand, eight hundred thirty-two".