21872350063 has 2 divisors, whose sum is σ = 21872350064. Its totient is φ = 21872350062.

The previous prime is 21872350033. The next prime is 21872350117. The reversal of 21872350063 is 36005327812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21872350063 is a prime.

It is a super-2 number, since 2×21872350063² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21872350013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10936175031 + 10936175032.

It is an arithmetic number, because the mean of its divisors is an integer number (10936175032).

Almost surely, 2^21872350063 is an apocalyptic number.

21872350063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21872350063 is an equidigital number, since it uses as much as digits as its factorization.

21872350063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

Adding to 21872350063 its reverse (36005327812), we get a palindrome (57877677875).

The spelling of 21872350063 in words is "twenty-one billion, eight hundred seventy-two million, three hundred fifty thousand, sixty-three".