21552236429 has 2 divisors, whose sum is σ = 21552236430. Its totient is φ = 21552236428.

The previous prime is 21552236399. The next prime is 21552236441. The reversal of 21552236429 is 92463225512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19879590025 + 1672646404 = 140995^2 + 40898^2 .

It is a cyclic number.

It is not a de Polignac number, because 21552236429 - 2¹² = 21552232333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21552235429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10776118214 + 10776118215.

It is an arithmetic number, because the mean of its divisors is an integer number (10776118215).

Almost surely, 2^21552236429 is an apocalyptic number.

It is an amenable number.

21552236429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21552236429 is an equidigital number, since it uses as much as digits as its factorization.

21552236429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 41.

The spelling of 21552236429 in words is "twenty-one billion, five hundred fifty-two million, two hundred thirty-six thousand, four hundred twenty-nine".