21461128 has 32 divisors (see below), whose sum is σ = 44352000. Its totient is φ = 9672768.

The previous prime is 21461113. The next prime is 21461137. The reversal of 21461128 is 82116412.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2073 + ... + 6871.

It is an arithmetic number, because the mean of its divisors is an integer number (1386000).

Almost surely, 2^21461128 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 21461128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22176000).

21461128 is an abundant number, since it is smaller than the sum of its proper divisors (22890872).

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

21461128 is a wasteful number, since it uses less digits than its factorization.

21461128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4861 (or 4857 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 21461128 is about 4632.6156758358. The cubic root of 21461128 is about 277.8972067900.

The spelling of 21461128 in words is "twenty-one million, four hundred sixty-one thousand, one hundred twenty-eight".