21616232035553 has 2 divisors, whose sum is σ = 21616232035554. Its totient is φ = 21616232035552.

The previous prime is 21616232035529. The next prime is 21616232035669. The reversal of 21616232035553 is 35553023261612.

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., 20932198829584 + 684033205969 = 4575172^2 + 827063^2 .

It is a cyclic number.

It is not a de Polignac number, because 21616232035553 - 2³² = 21611937068257 is a prime.

It is a super-2 number, since 2×21616232035553² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21616232032553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808116017776 + 10808116017777.

It is an arithmetic number, because the mean of its divisors is an integer number (10808116017777).

Almost surely, 2^{21616232035553} is an apocalyptic number.

It is an amenable number.

21616232035553 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616232035553 is an equidigital number, since it uses as much as digits as its factorization.

21616232035553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972000, while the sum is 44.

The spelling of 21616232035553 in words is "twenty-one trillion, six hundred sixteen billion, two hundred thirty-two million, thirty-five thousand, five hundred fifty-three".