220621845808541 has 2 divisors, whose sum is σ = 220621845808542. Its totient is φ = 220621845808540.

The previous prime is 220621845808487. The next prime is 220621845808687. The reversal of 220621845808541 is 145808548126022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175611634437316 + 45010211371225 = 13251854^2 + 6708965^2 .

It is a cyclic number.

It is not a de Polignac number, because 220621845808541 - 2²⁶ = 220621778699677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220621845808241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110310922904270 + 110310922904271.

It is an arithmetic number, because the mean of its divisors is an integer number (110310922904271).

Almost surely, 2^{220621845808541} is an apocalyptic number.

It is an amenable number.

220621845808541 is a deficient number, since it is larger than the sum of its proper divisors (1).

220621845808541 is an equidigital number, since it uses as much as digits as its factorization.

220621845808541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9830400, while the sum is 56.

The spelling of 220621845808541 in words is "two hundred twenty trillion, six hundred twenty-one billion, eight hundred forty-five million, eight hundred eight thousand, five hundred forty-one".