21488100377 has 2 divisors, whose sum is σ = 21488100378. Its totient is φ = 21488100376.

The previous prime is 21488100307. The next prime is 21488100397. The reversal of 21488100377 is 77300188412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20353016896 + 1135083481 = 142664^2 + 33691^2 .

It is a cyclic number.

It is not a de Polignac number, because 21488100377 - 2⁸ = 21488100121 is a prime.

It is not a weakly prime, because it can be changed into another prime (21488100307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10744050188 + 10744050189.

It is an arithmetic number, because the mean of its divisors is an integer number (10744050189).

Almost surely, 2^21488100377 is an apocalyptic number.

It is an amenable number.

21488100377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21488100377 is an equidigital number, since it uses as much as digits as its factorization.

21488100377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 41.

Adding to 21488100377 its reverse (77300188412), we get a palindrome (98788288789).

The spelling of 21488100377 in words is "twenty-one billion, four hundred eighty-eight million, one hundred thousand, three hundred seventy-seven".