21113161663355 has 4 divisors (see below), whose sum is σ = 25335793996032. Its totient is φ = 16890529330680.

The previous prime is 21113161663333. The next prime is 21113161663369. The reversal of 21113161663355 is 55336616131112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21113161663355 - 2¹⁰ = 21113161662331 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2111316166331 + ... + 2111316166340.

It is an arithmetic number, because the mean of its divisors is an integer number (6333948499008).

Almost surely, 2^{21113161663355} is an apocalyptic number.

21113161663355 is a deficient number, since it is larger than the sum of its proper divisors (4222632332677).

21113161663355 is an equidigital number, since it uses as much as digits as its factorization.

21113161663355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222632332676.

The product of its digits is 291600, while the sum is 44.

Adding to 21113161663355 its reverse (55336616131112), we get a palindrome (76449777794467).

The spelling of 21113161663355 in words is "twenty-one trillion, one hundred thirteen billion, one hundred sixty-one million, six hundred sixty-three thousand, three hundred fifty-five".