21240216235 has 32 divisors (see below), whose sum is σ = 29956262400. Its totient is φ = 14156862720.

The previous prime is 21240216199. The next prime is 21240216247. The reversal of 21240216235 is 53261204212.

It is not a de Polignac number, because 21240216235 - 2²¹ = 21238119083 is a prime.

It is a super-3 number, since 3×21240216235³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 126000 + ... + 241570.

It is an arithmetic number, because the mean of its divisors is an integer number (936133200).

Almost surely, 2^21240216235 is an apocalyptic number.

21240216235 is a deficient number, since it is larger than the sum of its proper divisors (8716046165).

21240216235 is a wasteful number, since it uses less digits than its factorization.

21240216235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115731.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 21240216235 in words is "twenty-one billion, two hundred forty million, two hundred sixteen thousand, two hundred thirty-five".