21020694 has 8 divisors (see below), whose sum is σ = 42041400. Its totient is φ = 7006896.

The previous prime is 21020683. The next prime is 21020719. The reversal of 21020694 is 49602012.

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

21020694 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751719 + ... + 1751730.

It is an arithmetic number, because the mean of its divisors is an integer number (5255175).

Almost surely, 2^21020694 is an apocalyptic number.

21020694 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.

21020694 is a wasteful number, since it uses less digits than its factorization.

21020694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503454.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21020694 is about 4584.8330394901. The cubic root of 21020694 is about 275.9830119769.

The spelling of 21020694 in words is "twenty-one million, twenty thousand, six hundred ninety-four".