21502000851 has 8 divisors (see below), whose sum is σ = 28673334720. Its totient is φ = 14332667112.

The previous prime is 21502000829. The next prime is 21502000859. The reversal of 21502000851 is 15800020512.

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

It is not a de Polignac number, because 21502000851 - 2⁹ = 21502000339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21502000859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474765 + ... + 518078.

It is an arithmetic number, because the mean of its divisors is an integer number (3584166840).

Almost surely, 2^21502000851 is an apocalyptic number.

21502000851 is the 92741-st centered pentagonal number.

21502000851 is a deficient number, since it is larger than the sum of its proper divisors (7171333869).

21502000851 is an equidigital number, since it uses as much as digits as its factorization.

21502000851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000065.

The product of its (nonzero) digits is 800, while the sum is 24.

It can be divided in two parts, 2150 and 2000851, that added together give a triangular number (2003001 = T₂₀₀₁).

The spelling of 21502000851 in words is "twenty-one billion, five hundred two million, eight hundred fifty-one", and thus it is an aban number.