21653260244043 has 8 divisors (see below), whose sum is σ = 29651311325328. Its totient is φ = 14045357996064.

The previous prime is 21653260244027. The next prime is 21653260244053. The reversal of 21653260244043 is 34044206235612.

It is a happy number.

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

It is not a de Polignac number, because 21653260244043 - 2⁴ = 21653260244027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21653260243986 and 21653260244004.

It is not an unprimeable number, because it can be changed into a prime (21653260244053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97537208196 + ... + 97537208417.

It is an arithmetic number, because the mean of its divisors is an integer number (3706413915666).

Almost surely, 2^{21653260244043} is an apocalyptic number.

21653260244043 is a deficient number, since it is larger than the sum of its proper divisors (7998051081285).

21653260244043 is a wasteful number, since it uses less digits than its factorization.

21653260244043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195074416653.

The product of its (nonzero) digits is 829440, while the sum is 42.

Adding to 21653260244043 its reverse (34044206235612), we get a palindrome (55697466479655).

The spelling of 21653260244043 in words is "twenty-one trillion, six hundred fifty-three billion, two hundred sixty million, two hundred forty-four thousand, forty-three".