21152628 has 36 divisors (see below), whose sum is σ = 61108320. Its totient is φ = 6043536.

The previous prime is 21152591. The next prime is 21152657. The reversal of 21152628 is 82625112.

It is a happy number.

21152628 is a `hidden beast` number, since 21 + 15 + 2 + 628 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 41718 + ... + 42221.

Almost surely, 2^21152628 is an apocalyptic number.

21152628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21152628 is an abundant number, since it is smaller than the sum of its proper divisors (39955692).

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

21152628 is a wasteful number, since it uses less digits than its factorization.

21152628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83956 (or 83951 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 21152628 is about 4599.1986258478. The cubic root of 21152628 is about 276.5592002096.

The spelling of 21152628 in words is "twenty-one million, one hundred fifty-two thousand, six hundred twenty-eight".