21000653135 has 32 divisors (see below), whose sum is σ = 31535253504. Its totient is φ = 13042944000.

The previous prime is 21000653101. The next prime is 21000653153. The reversal of 21000653135 is 53135600012.

It is not a de Polignac number, because 21000653135 - 2¹⁰ = 21000652111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3695 + ... + 204975.

It is an arithmetic number, because the mean of its divisors is an integer number (985476672).

Almost surely, 2^21000653135 is an apocalyptic number.

21000653135 is a deficient number, since it is larger than the sum of its proper divisors (10534600369).

21000653135 is a wasteful number, since it uses less digits than its factorization.

21000653135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201575.

The product of its (nonzero) digits is 2700, while the sum is 26.

The spelling of 21000653135 in words is "twenty-one billion, six hundred fifty-three thousand, one hundred thirty-five".