21893828837 has 2 divisors, whose sum is σ = 21893828838. Its totient is φ = 21893828836.

The previous prime is 21893828773. The next prime is 21893828857. The reversal of 21893828837 is 73882839812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20367285796 + 1526543041 = 142714^2 + 39071^2 .

It is a cyclic number.

It is not a de Polignac number, because 21893828837 - 2⁶ = 21893828773 is a prime.

It is a super-2 number, since 2×21893828837² (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 (21893828857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10946914418 + 10946914419.

It is an arithmetic number, because the mean of its divisors is an integer number (10946914419).

Almost surely, 2^21893828837 is an apocalyptic number.

It is an amenable number.

21893828837 is a deficient number, since it is larger than the sum of its proper divisors (1).

21893828837 is an equidigital number, since it uses as much as digits as its factorization.

21893828837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 59.

The spelling of 21893828837 in words is "twenty-one billion, eight hundred ninety-three million, eight hundred twenty-eight thousand, eight hundred thirty-seven".