21028674 has 8 divisors (see below), whose sum is σ = 42057360. Its totient is φ = 7009556.

The previous prime is 21028673. The next prime is 21028697. The reversal of 21028674 is 47682012.

It is a sphenic number, since it is the product of 3 distinct primes.

21028674 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21028673) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1752384 + ... + 1752395.

It is an arithmetic number, because the mean of its divisors is an integer number (5257170).

Almost surely, 2^21028674 is an apocalyptic number.

21028674 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21028674 is a wasteful number, since it uses less digits than its factorization.

21028674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3504784.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 21028674 is about 4585.7032176101. The cubic root of 21028674 is about 276.0179309922.

The spelling of 21028674 in words is "twenty-one million, twenty-eight thousand, six hundred seventy-four".