21241413377 has 2 divisors, whose sum is σ = 21241413378. Its totient is φ = 21241413376.

The previous prime is 21241413331. The next prime is 21241413421. The reversal of 21241413377 is 77331414212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18516677776 + 2724735601 = 136076^2 + 52199^2 .

It is a cyclic number.

It is not a de Polignac number, because 21241413377 - 2²⁴ = 21224636161 is a prime.

It is not a weakly prime, because it can be changed into another prime (21241413577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620706688 + 10620706689.

It is an arithmetic number, because the mean of its divisors is an integer number (10620706689).

Almost surely, 2^21241413377 is an apocalyptic number.

It is an amenable number.

21241413377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241413377 is an equidigital number, since it uses as much as digits as its factorization.

21241413377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 35.

Adding to 21241413377 its reverse (77331414212), we get a palindrome (98572827589).

The spelling of 21241413377 in words is "twenty-one billion, two hundred forty-one million, four hundred thirteen thousand, three hundred seventy-seven".