21552303407 has 2 divisors, whose sum is σ = 21552303408. Its totient is φ = 21552303406.

The previous prime is 21552303397. The next prime is 21552303413. The reversal of 21552303407 is 70430325512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21552303407 - 2¹² = 21552299311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21552303467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10776151703 + 10776151704.

It is an arithmetic number, because the mean of its divisors is an integer number (10776151704).

Almost surely, 2^21552303407 is an apocalyptic number.

21552303407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21552303407 is an equidigital number, since it uses as much as digits as its factorization.

21552303407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 32.

Adding to 21552303407 its reverse (70430325512), we get a palindrome (91982628919).

The spelling of 21552303407 in words is "twenty-one billion, five hundred fifty-two million, three hundred three thousand, four hundred seven".