21888673837 has 2 divisors, whose sum is σ = 21888673838. Its totient is φ = 21888673836.

The previous prime is 21888673811. The next prime is 21888673841. The reversal of 21888673837 is 73837688812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11400046441 + 10488627396 = 106771^2 + 102414^2 .

It is a cyclic number.

It is not a de Polignac number, because 21888673837 - 2¹¹ = 21888671789 is a prime.

It is a super-2 number, since 2×21888673837² (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 (21888673847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944336918 + 10944336919.

It is an arithmetic number, because the mean of its divisors is an integer number (10944336919).

Almost surely, 2^21888673837 is an apocalyptic number.

It is an amenable number.

21888673837 is a deficient number, since it is larger than the sum of its proper divisors (1).

21888673837 is an equidigital number, since it uses as much as digits as its factorization.

21888673837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21676032, while the sum is 61.

The spelling of 21888673837 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred seventy-three thousand, eight hundred thirty-seven".