21035502005 has 16 divisors (see below), whose sum is σ = 29103992064. Its totient is φ = 14296692480.

The previous prime is 21035501999. The next prime is 21035502017. The reversal of 21035502005 is 50020553012.

It is not a de Polignac number, because 21035502005 - 2¹² = 21035497909 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 2655401 + ... + 2663310.

It is an arithmetic number, because the mean of its divisors is an integer number (1818999504).

Almost surely, 2^21035502005 is an apocalyptic number.

It is an amenable number.

21035502005 is a deficient number, since it is larger than the sum of its proper divisors (8068490059).

21035502005 is a wasteful number, since it uses less digits than its factorization.

21035502005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5318836.

The product of its (nonzero) digits is 1500, while the sum is 23.

The spelling of 21035502005 in words is "twenty-one billion, thirty-five million, five hundred two thousand, five".