21123160326611 has 4 divisors (see below), whose sum is σ = 24140754658992. Its totient is φ = 18105565994232.

The previous prime is 21123160326557. The next prime is 21123160326623. The reversal of 21123160326611 is 11662306132112.

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

It is a cyclic number.

It is not a de Polignac number, because 21123160326611 - 2³⁴ = 21105980457427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123160326811) 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, 1508797166180 + ... + 1508797166193.

It is an arithmetic number, because the mean of its divisors is an integer number (6035188664748).

Almost surely, 2^{21123160326611} is an apocalyptic number.

21123160326611 is a deficient number, since it is larger than the sum of its proper divisors (3017594332381).

21123160326611 is an equidigital number, since it uses as much as digits as its factorization.

21123160326611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017594332380.

The product of its (nonzero) digits is 15552, while the sum is 35.

Adding to 21123160326611 its reverse (11662306132112), we get a palindrome (32785466458723).

The spelling of 21123160326611 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred sixty million, three hundred twenty-six thousand, six hundred eleven".