21162107260643 has 2 divisors, whose sum is σ = 21162107260644. Its totient is φ = 21162107260642.

The previous prime is 21162107260627. The next prime is 21162107260751. The reversal of 21162107260643 is 34606270126112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21162107260643 - 2⁴ = 21162107260627 is a prime.

It is a super-4 number, since 4×21162107260643⁴ (a number of 54 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21162107260643.

It is not a weakly prime, because it can be changed into another prime (21162107200643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581053630321 + 10581053630322.

It is an arithmetic number, because the mean of its divisors is an integer number (10581053630322).

Almost surely, 2^{21162107260643} is an apocalyptic number.

21162107260643 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162107260643 is an equidigital number, since it uses as much as digits as its factorization.

21162107260643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

Adding to 21162107260643 its reverse (34606270126112), we get a palindrome (55768377386755).

The spelling of 21162107260643 in words is "twenty-one trillion, one hundred sixty-two billion, one hundred seven million, two hundred sixty thousand, six hundred forty-three".