21352235653 has 16 divisors (see below), whose sum is σ = 24526957824. Its totient is φ = 18208788480.

The previous prime is 21352235647. The next prime is 21352235669. The reversal of 21352235653 is 35653225312.

It is a cyclic number.

It is not a de Polignac number, because 21352235653 - 2⁵ = 21352235621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352235153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1589023 + ... + 1602403.

It is an arithmetic number, because the mean of its divisors is an integer number (1532934864).

Almost surely, 2^21352235653 is an apocalyptic number.

It is an amenable number.

21352235653 is a deficient number, since it is larger than the sum of its proper divisors (3174722171).

21352235653 is a wasteful number, since it uses less digits than its factorization.

21352235653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14532.

The product of its digits is 162000, while the sum is 37.

The spelling of 21352235653 in words is "twenty-one billion, three hundred fifty-two million, two hundred thirty-five thousand, six hundred fifty-three".