21889683797 has 2 divisors, whose sum is σ = 21889683798. Its totient is φ = 21889683796.

The previous prime is 21889683757. The next prime is 21889683839. The reversal of 21889683797 is 79738698812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10974867121 + 10914816676 = 104761^2 + 104474^2 .

It is a cyclic number.

It is not a de Polignac number, because 21889683797 - 2¹² = 21889679701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21889683727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944841898 + 10944841899.

It is an arithmetic number, because the mean of its divisors is an integer number (10944841899).

Almost surely, 2^21889683797 is an apocalyptic number.

It is an amenable number.

21889683797 is a deficient number, since it is larger than the sum of its proper divisors (1).

21889683797 is an equidigital number, since it uses as much as digits as its factorization.

21889683797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 68.

The spelling of 21889683797 in words is "twenty-one billion, eight hundred eighty-nine million, six hundred eighty-three thousand, seven hundred ninety-seven".