21384968053 has 2 divisors, whose sum is σ = 21384968054. Its totient is φ = 21384968052.

The previous prime is 21384967997. The next prime is 21384968069. The reversal of 21384968053 is 35086948312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18616419364 + 2768548689 = 136442^2 + 52617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21384968053 is a prime.

It is a super-2 number, since 2×21384968053² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21384967988 and 21384968006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21384968153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10692484026 + 10692484027.

It is an arithmetic number, because the mean of its divisors is an integer number (10692484027).

Almost surely, 2^21384968053 is an apocalyptic number.

It is an amenable number.

21384968053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21384968053 is an equidigital number, since it uses as much as digits as its factorization.

21384968053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 21384968053 in words is "twenty-one billion, three hundred eighty-four million, nine hundred sixty-eight thousand, fifty-three".