21221535303043 has 2 divisors, whose sum is σ = 21221535303044. Its totient is φ = 21221535303042.

The previous prime is 21221535303041. The next prime is 21221535303049. The reversal of 21221535303043 is 34030353512212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221535303043 - 2¹ = 21221535303041 is a prime.

Together with 21221535303041, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21221535303041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610767651521 + 10610767651522.

It is an arithmetic number, because the mean of its divisors is an integer number (10610767651522).

Almost surely, 2^{21221535303043} is an apocalyptic number.

21221535303043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221535303043 is an equidigital number, since it uses as much as digits as its factorization.

21221535303043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 34.

Adding to 21221535303043 its reverse (34030353512212), we get a palindrome (55251888815255).

The spelling of 21221535303043 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred thirty-five million, three hundred three thousand, forty-three".