221524312006157 has 2 divisors, whose sum is σ = 221524312006158. Its totient is φ = 221524312006156.

The previous prime is 221524312006141. The next prime is 221524312006159. The reversal of 221524312006157 is 751600213425122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143035715740516 + 78488596265641 = 11959754^2 + 8859379^2 .

It is a cyclic number.

It is not a de Polignac number, because 221524312006157 - 2⁴ = 221524312006141 is a prime.

Together with 221524312006159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221524312006159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110762156003078 + 110762156003079.

It is an arithmetic number, because the mean of its divisors is an integer number (110762156003079).

Almost surely, 2^{221524312006157} is an apocalyptic number.

It is an amenable number.

221524312006157 is a deficient number, since it is larger than the sum of its proper divisors (1).

221524312006157 is an equidigital number, since it uses as much as digits as its factorization.

221524312006157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 221524312006157 in words is "two hundred twenty-one trillion, five hundred twenty-four billion, three hundred twelve million, six thousand, one hundred fifty-seven".