21401332334477 has 2 divisors, whose sum is σ = 21401332334478. Its totient is φ = 21401332334476.

The previous prime is 21401332334413. The next prime is 21401332334519. The reversal of 21401332334477 is 77443323310412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21393039318121 + 8293016356 = 4625261^2 + 91066^2 .

It is a cyclic number.

It is not a de Polignac number, because 21401332334477 - 2⁶ = 21401332334413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21401332333477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700666167238 + 10700666167239.

It is an arithmetic number, because the mean of its divisors is an integer number (10700666167239).

Almost surely, 2^{21401332334477} is an apocalyptic number.

It is an amenable number.

21401332334477 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401332334477 is an equidigital number, since it uses as much as digits as its factorization.

21401332334477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 44.

Adding to 21401332334477 its reverse (77443323310412), we get a palindrome (98844655644889).

The spelling of 21401332334477 in words is "twenty-one trillion, four hundred one billion, three hundred thirty-two million, three hundred thirty-four thousand, four hundred seventy-seven".