221115410515381 has 2 divisors, whose sum is σ = 221115410515382. Its totient is φ = 221115410515380.

The previous prime is 221115410515379. The next prime is 221115410515423. The reversal of 221115410515381 is 183515014511122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184927606218481 + 36187804296900 = 13598809^2 + 6015630^2 .

It is a cyclic number.

It is not a de Polignac number, because 221115410515381 - 2¹ = 221115410515379 is a prime.

It is a super-2 number, since 2×221115410515381² (a number of 29 digits) contains 22 as substring.

Together with 221115410515379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221115410525381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110557705257690 + 110557705257691.

It is an arithmetic number, because the mean of its divisors is an integer number (110557705257691).

Almost surely, 2^{221115410515381} is an apocalyptic number.

It is an amenable number.

221115410515381 is a deficient number, since it is larger than the sum of its proper divisors (1).

221115410515381 is an equidigital number, since it uses as much as digits as its factorization.

221115410515381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48000, while the sum is 40.

The spelling of 221115410515381 in words is "two hundred twenty-one trillion, one hundred fifteen billion, four hundred ten million, five hundred fifteen thousand, three hundred eighty-one".