21552303413 has 2 divisors, whose sum is σ = 21552303414. Its totient is φ = 21552303412.

The previous prime is 21552303407. The next prime is 21552303449. The reversal of 21552303413 is 31430325512.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14606414449 + 6945888964 = 120857^2 + 83342^2 .

It is a cyclic number.

It is not a de Polignac number, because 21552303413 - 2⁴ = 21552303397 is a prime.

It is a super-2 number, since 2×21552303413² (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 (21552303313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10776151706 + 10776151707.

It is an arithmetic number, because the mean of its divisors is an integer number (10776151707).

Almost surely, 2^21552303413 is an apocalyptic number.

It is an amenable number.

21552303413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21552303413 is an equidigital number, since it uses as much as digits as its factorization.

21552303413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 21552303413 its reverse (31430325512), we get a palindrome (52982628925).

The spelling of 21552303413 in words is "twenty-one billion, five hundred fifty-two million, three hundred three thousand, four hundred thirteen".