21653040640135 has 8 divisors (see below), whose sum is σ = 25983674590176. Its totient is φ = 17322415297440.

The previous prime is 21653040640129. The next prime is 21653040640151. The reversal of 21653040640135 is 53104604035612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21653040640135 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6671877 + ... + 9371233.

It is an arithmetic number, because the mean of its divisors is an integer number (3247959323772).

Almost surely, 2^{21653040640135} is an apocalyptic number.

21653040640135 is a deficient number, since it is larger than the sum of its proper divisors (4330633950041).

21653040640135 is a wasteful number, since it uses less digits than its factorization.

21653040640135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4303673.

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 21653040640135 its reverse (53104604035612), we get a palindrome (74757644675747).

The spelling of 21653040640135 in words is "twenty-one trillion, six hundred fifty-three billion, forty million, six hundred forty thousand, one hundred thirty-five".