21355434083 has 2 divisors, whose sum is σ = 21355434084. Its totient is φ = 21355434082.

The previous prime is 21355434053. The next prime is 21355434103. The reversal of 21355434083 is 38043455312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21355434083 - 2⁶ = 21355434019 is a prime.

It is not a weakly prime, because it can be changed into another prime (21355434053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677717041 + 10677717042.

It is an arithmetic number, because the mean of its divisors is an integer number (10677717042).

Almost surely, 2^21355434083 is an apocalyptic number.

21355434083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355434083 is an equidigital number, since it uses as much as digits as its factorization.

21355434083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 21355434083 its reverse (38043455312), we get a palindrome (59398889395).

The spelling of 21355434083 in words is "twenty-one billion, three hundred fifty-five million, four hundred thirty-four thousand, eighty-three".