21241442377 has 2 divisors, whose sum is σ = 21241442378. Its totient is φ = 21241442376.

The previous prime is 21241442347. The next prime is 21241442473. The reversal of 21241442377 is 77324414212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13557342096 + 7684100281 = 116436^2 + 87659^2 .

It is a cyclic number.

It is not a de Polignac number, because 21241442377 - 2²³ = 21233053769 is a prime.

It is a super-2 number, since 2×21241442377² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21241442347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620721188 + 10620721189.

It is an arithmetic number, because the mean of its divisors is an integer number (10620721189).

Almost surely, 2^21241442377 is an apocalyptic number.

It is an amenable number.

21241442377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241442377 is an equidigital number, since it uses as much as digits as its factorization.

21241442377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 37.

Adding to 21241442377 its reverse (77324414212), we get a palindrome (98565856589).

The spelling of 21241442377 in words is "twenty-one billion, two hundred forty-one million, four hundred forty-two thousand, three hundred seventy-seven".