21653453013 has 8 divisors (see below), whose sum is σ = 28899062400. Its totient is φ = 14421739488.

The previous prime is 21653452991. The next prime is 21653453033. The reversal of 21653453013 is 31035435612.

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

It is not a de Polignac number, because 21653453013 - 2⁶ = 21653452949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653453033) 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 7 ways as a sum of consecutive naturals, for example, 3470328 + ... + 3476561.

It is an arithmetic number, because the mean of its divisors is an integer number (3612382800).

Almost surely, 2^21653453013 is an apocalyptic number.

It is an amenable number.

21653453013 is a deficient number, since it is larger than the sum of its proper divisors (7245609387).

21653453013 is a wasteful number, since it uses less digits than its factorization.

21653453013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6947931.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 21653453013 its reverse (31035435612), we get a palindrome (52688888625).

The spelling of 21653453013 in words is "twenty-one billion, six hundred fifty-three million, four hundred fifty-three thousand, thirteen".