221020292077213 has 2 divisors, whose sum is σ = 221020292077214. Its totient is φ = 221020292077212.

The previous prime is 221020292077141. The next prime is 221020292077229. The reversal of 221020292077213 is 312770292020122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194110571575449 + 26909720501764 = 13932357^2 + 5187458^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020292077213 - 2¹³ = 221020292069021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020292077513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510146038606 + 110510146038607.

It is an arithmetic number, because the mean of its divisors is an integer number (110510146038607).

Almost surely, 2^{221020292077213} is an apocalyptic number.

It is an amenable number.

221020292077213 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020292077213 is an equidigital number, since it uses as much as digits as its factorization.

221020292077213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 221020292077213 in words is "two hundred twenty-one trillion, twenty billion, two hundred ninety-two million, seventy-seven thousand, two hundred thirteen".