21621411422363 has 2 divisors, whose sum is σ = 21621411422364. Its totient is φ = 21621411422362.

The previous prime is 21621411422341. The next prime is 21621411422407. The reversal of 21621411422363 is 36322411412612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21621411422363 - 2²² = 21621407228059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21621411424363) 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, 10810705711181 + 10810705711182.

It is an arithmetic number, because the mean of its divisors is an integer number (10810705711182).

Almost surely, 2^{21621411422363} is an apocalyptic number.

21621411422363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21621411422363 is an equidigital number, since it uses as much as digits as its factorization.

21621411422363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 38.

Adding to 21621411422363 its reverse (36322411412612), we get a palindrome (57943822834975).

The spelling of 21621411422363 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred eleven million, four hundred twenty-two thousand, three hundred sixty-three".