21623563210353 has 16 divisors (see below), whose sum is σ = 31093011983040. Its totient is φ = 13288039694784.

The previous prime is 21623563210349. The next prime is 21623563210357. The reversal of 21623563210353 is 35301236532612.

It is an interprime number because it is at equal distance from previous prime (21623563210349) and next prime (21623563210357).

It is not a de Polignac number, because 21623563210353 - 2² = 21623563210349 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21623563210357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390981051 + ... + 391036352.

It is an arithmetic number, because the mean of its divisors is an integer number (1943313248940).

Almost surely, 2^{21623563210353} is an apocalyptic number.

It is an amenable number.

21623563210353 is a deficient number, since it is larger than the sum of its proper divisors (9469448772687).

21623563210353 is a wasteful number, since it uses less digits than its factorization.

21623563210353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782018128.

The product of its (nonzero) digits is 583200, while the sum is 42.

Adding to 21623563210353 its reverse (35301236532612), we get a palindrome (56924799742965).

The spelling of 21623563210353 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred sixty-three million, two hundred ten thousand, three hundred fifty-three".