21015705006 has 48 divisors (see below), whose sum is σ = 46029005568. Its totient is φ = 6929283600.

The previous prime is 21015704921. The next prime is 21015705023. The reversal of 21015705006 is 60050751012.

21015705006 is a `hidden beast` number, since 2 + 1 + 0 + 157 + 0 + 500 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1322971 + ... + 1338761.

It is an arithmetic number, because the mean of its divisors is an integer number (958937616).

Almost surely, 2^21015705006 is an apocalyptic number.

21015705006 is an abundant number, since it is smaller than the sum of its proper divisors (25013300562).

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

21015705006 is a wasteful number, since it uses less digits than its factorization.

21015705006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16597 (or 16594 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The spelling of 21015705006 in words is "twenty-one billion, fifteen million, seven hundred five thousand, six".