21414414377 has 2 divisors, whose sum is σ = 21414414378. Its totient is φ = 21414414376.

The previous prime is 21414414323. The next prime is 21414414383. The reversal of 21414414377 is 77341441412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16890641296 + 4523773081 = 129964^2 + 67259^2 .

It is a cyclic number.

It is not a de Polignac number, because 21414414377 - 2⁶ = 21414414313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21414414377.

It is not a weakly prime, because it can be changed into another prime (21414410377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707207188 + 10707207189.

It is an arithmetic number, because the mean of its divisors is an integer number (10707207189).

Almost surely, 2^21414414377 is an apocalyptic number.

It is an amenable number.

21414414377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21414414377 is an equidigital number, since it uses as much as digits as its factorization.

21414414377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 38.

Adding to 21414414377 its reverse (77341441412), we get a palindrome (98755855789).

The spelling of 21414414377 in words is "twenty-one billion, four hundred fourteen million, four hundred fourteen thousand, three hundred seventy-seven".