21889683481 has 2 divisors, whose sum is σ = 21889683482. Its totient is φ = 21889683480.

The previous prime is 21889683461. The next prime is 21889683493. The reversal of 21889683481 is 18438698812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21858144025 + 31539456 = 147845^2 + 5616^2 .

It is a cyclic number.

It is not a de Polignac number, because 21889683481 - 2⁵ = 21889683449 is a prime.

It is a super-2 number, since 2×21889683481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21889683461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944841740 + 10944841741.

It is an arithmetic number, because the mean of its divisors is an integer number (10944841741).

Almost surely, 2^21889683481 is an apocalyptic number.

It is an amenable number.

21889683481 is a deficient number, since it is larger than the sum of its proper divisors (1).

21889683481 is an equidigital number, since it uses as much as digits as its factorization.

21889683481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5308416, while the sum is 58.

The spelling of 21889683481 in words is "twenty-one billion, eight hundred eighty-nine million, six hundred eighty-three thousand, four hundred eighty-one".