21005453235 has 16 divisors (see below), whose sum is σ = 36194012064. Its totient is φ = 10341146112.

The previous prime is 21005453213. The next prime is 21005453243. The reversal of 21005453235 is 53235450012.

It is not a de Polignac number, because 21005453235 - 2⁶ = 21005453171 is a prime.

It is a super-3 number, since 3×21005453235³ (a number of 32 digits) contains 333 as substring.

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, 53859942 + ... + 53860331.

It is an arithmetic number, because the mean of its divisors is an integer number (2262125754).

Almost surely, 2^21005453235 is an apocalyptic number.

21005453235 is a deficient number, since it is larger than the sum of its proper divisors (15188558829).

21005453235 is a wasteful number, since it uses less digits than its factorization.

21005453235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107720294.

The product of its (nonzero) digits is 18000, while the sum is 30.

The spelling of 21005453235 in words is "twenty-one billion, five million, four hundred fifty-three thousand, two hundred thirty-five".