21061128 has 32 divisors (see below), whose sum is σ = 57440160. Its totient is φ = 6382080.

The previous prime is 21061127. The next prime is 21061129. The reversal of 21061128 is 82116012.

It is an interprime number because it is at equal distance from previous prime (21061127) and next prime (21061129).

It is a super-2 number, since 2×21061128² = 887142225264768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21061127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39625 + ... + 40152.

It is an arithmetic number, because the mean of its divisors is an integer number (1795005).

Almost surely, 2^21061128 is an apocalyptic number.

It is an amenable number.

21061128 is an abundant number, since it is smaller than the sum of its proper divisors (36379032).

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

21061128 is a wasteful number, since it uses less digits than its factorization.

21061128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79797 (or 79793 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 21061128 is about 4589.2404600326. The cubic root of 21061128 is about 276.1598527887.

The spelling of 21061128 in words is "twenty-one million, sixty-one thousand, one hundred twenty-eight".