21053555235 has 48 divisors (see below), whose sum is σ = 37908089856. Its totient is φ = 11209671648.

The previous prime is 21053555219. The next prime is 21053555251. The reversal of 21053555235 is 53255535012.

21053555235 is a `hidden beast` number, since 21 + 0 + 53 + 5 + 552 + 35 = 666.

It is an interprime number because it is at equal distance from previous prime (21053555219) and next prime (21053555251).

It is not a de Polignac number, because 21053555235 - 2⁴ = 21053555219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21053555235.

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 47 ways as a sum of consecutive naturals, for example, 723232 + ... + 751778.

It is an arithmetic number, because the mean of its divisors is an integer number (789751872).

Almost surely, 2^21053555235 is an apocalyptic number.

21053555235 is a deficient number, since it is larger than the sum of its proper divisors (16854534621).

21053555235 is an equidigital number, since it uses as much as digits as its factorization.

21053555235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29174 (or 29162 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 36.

The spelling of 21053555235 in words is "twenty-one billion, fifty-three million, five hundred fifty-five thousand, two hundred thirty-five".