21553132052099 has 2 divisors, whose sum is σ = 21553132052100. Its totient is φ = 21553132052098.

The previous prime is 21553132052087. The next prime is 21553132052171. The reversal of 21553132052099 is 99025023135512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21553132052099 - 2¹² = 21553132048003 is a prime.

It is not a weakly prime, because it can be changed into another prime (21553132052399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10776566026049 + 10776566026050.

It is an arithmetic number, because the mean of its divisors is an integer number (10776566026050).

Almost surely, 2^{21553132052099} is an apocalyptic number.

21553132052099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21553132052099 is an equidigital number, since it uses as much as digits as its factorization.

21553132052099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729000, while the sum is 47.

The spelling of 21553132052099 in words is "twenty-one trillion, five hundred fifty-three billion, one hundred thirty-two million, fifty-two thousand, ninety-nine".