21352103447 has 2 divisors, whose sum is σ = 21352103448. Its totient is φ = 21352103446.

The previous prime is 21352103417. The next prime is 21352103453. The reversal of 21352103447 is 74430125312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21352103447 is a prime.

It is a super-2 number, since 2×21352103447² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21352103407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676051723 + 10676051724.

It is an arithmetic number, because the mean of its divisors is an integer number (10676051724).

Almost surely, 2^21352103447 is an apocalyptic number.

21352103447 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352103447 is an equidigital number, since it uses as much as digits as its factorization.

21352103447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

Adding to 21352103447 its reverse (74430125312), we get a palindrome (95782228759).

The spelling of 21352103447 in words is "twenty-one billion, three hundred fifty-two million, one hundred three thousand, four hundred forty-seven".