21621411422341 has 2 divisors, whose sum is σ = 21621411422342. Its totient is φ = 21621411422340.

The previous prime is 21621411422231. The next prime is 21621411422363. The reversal of 21621411422341 is 14322411412612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20502068582241 + 1119342840100 = 4527921^2 + 1057990^2 .

It is a cyclic number.

It is not a de Polignac number, because 21621411422341 - 2⁴¹ = 19422388166789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21621411422297 and 21621411422306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21621411420341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810705711170 + 10810705711171.

It is an arithmetic number, because the mean of its divisors is an integer number (10810705711171).

Almost surely, 2^{21621411422341} is an apocalyptic number.

It is an amenable number.

21621411422341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21621411422341 is an equidigital number, since it uses as much as digits as its factorization.

21621411422341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 34.

Adding to 21621411422341 its reverse (14322411412612), we get a palindrome (35943822834953).

The spelling of 21621411422341 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred eleven million, four hundred twenty-two thousand, three hundred forty-one".