21140645235 has 16 divisors (see below), whose sum is σ = 33828572160. Its totient is φ = 11273830880.

The previous prime is 21140645233. The next prime is 21140645237. The reversal of 21140645235 is 53254604112.

It is an interprime number because it is at equal distance from previous prime (21140645233) and next prime (21140645237).

It is not a de Polignac number, because 21140645235 - 2¹ = 21140645233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21140645196 and 21140645205.

It is not an unprimeable number, because it can be changed into a prime (21140645233) by changing a digit.

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, 85456 + ... + 222674.

It is an arithmetic number, because the mean of its divisors is an integer number (2114285760).

Almost surely, 2^21140645235 is an apocalyptic number.

21140645235 is a deficient number, since it is larger than the sum of its proper divisors (12687926925).

21140645235 is a wasteful number, since it uses less digits than its factorization.

21140645235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147498.

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 21140645235 in words is "twenty-one billion, one hundred forty million, six hundred forty-five thousand, two hundred thirty-five".