21412401377 has 2 divisors, whose sum is σ = 21412401378. Its totient is φ = 21412401376.

The previous prime is 21412401349. The next prime is 21412401383. The reversal of 21412401377 is 77310421412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19143212881 + 2269188496 = 138359^2 + 47636^2 .

It is a cyclic number.

It is not a de Polignac number, because 21412401377 - 2²⁰ = 21411352801 is a prime.

It is a super-2 number, since 2×21412401377² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21412401077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706200688 + 10706200689.

It is an arithmetic number, because the mean of its divisors is an integer number (10706200689).

Almost surely, 2^21412401377 is an apocalyptic number.

It is an amenable number.

21412401377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412401377 is an equidigital number, since it uses as much as digits as its factorization.

21412401377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

Adding to 21412401377 its reverse (77310421412), we get a palindrome (98722822789).

The spelling of 21412401377 in words is "twenty-one billion, four hundred twelve million, four hundred one thousand, three hundred seventy-seven".