21624351212653 has 4 divisors (see below), whose sum is σ = 24713544243040. Its totient is φ = 18535158182268.

The previous prime is 21624351212623. The next prime is 21624351212663. The reversal of 21624351212653 is 35621215342612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21624351212653 - 2⁹ = 21624351212141 is a prime.

It is a super-2 number, since 2×21624351212653² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21624351212623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544596515183 + ... + 1544596515196.

It is an arithmetic number, because the mean of its divisors is an integer number (6178386060760).

Almost surely, 2^{21624351212653} is an apocalyptic number.

It is an amenable number.

21624351212653 is a deficient number, since it is larger than the sum of its proper divisors (3089193030387).

21624351212653 is an equidigital number, since it uses as much as digits as its factorization.

21624351212653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3089193030386.

The product of its digits is 518400, while the sum is 43.

The spelling of 21624351212653 in words is "twenty-one trillion, six hundred twenty-four billion, three hundred fifty-one million, two hundred twelve thousand, six hundred fifty-three".