21440242035 has 48 divisors (see below), whose sum is σ = 37361795328. Its totient is φ = 11373825600.

The previous prime is 21440242013. The next prime is 21440242049. The reversal of 21440242035 is 53024204412.

21440242035 is a `hidden beast` number, since 214 + 402 + 42 + 0 + 3 + 5 = 666.

It is not a de Polignac number, because 21440242035 - 2¹¹ = 21440239987 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 7989804 + ... + 7992486.

It is an arithmetic number, because the mean of its divisors is an integer number (778370736).

Almost surely, 2^21440242035 is an apocalyptic number.

21440242035 is a deficient number, since it is larger than the sum of its proper divisors (15921553293).

21440242035 is a wasteful number, since it uses less digits than its factorization.

21440242035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576 (or 3573 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 21440242035 its reverse (53024204412), we get a palindrome (74464446447).

The spelling of 21440242035 in words is "twenty-one billion, four hundred forty million, two hundred forty-two thousand, thirty-five".