21113131289 has 2 divisors, whose sum is σ = 21113131290. Its totient is φ = 21113131288.

The previous prime is 21113131229. The next prime is 21113131301. The reversal of 21113131289 is 98213131112.

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., 12997824064 + 8115307225 = 114008^2 + 90085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113131289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113131229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556565644 + 10556565645.

It is an arithmetic number, because the mean of its divisors is an integer number (10556565645).

Almost surely, 2^21113131289 is an apocalyptic number.

It is an amenable number.

21113131289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113131289 is an equidigital number, since it uses as much as digits as its factorization.

21113131289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 32.

The spelling of 21113131289 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-one thousand, two hundred eighty-nine".