221300381 has 2 divisors, whose sum is σ = 221300382. Its totient is φ = 221300380.

The previous prime is 221300357. The next prime is 221300461. The reversal of 221300381 is 183003122.

221300381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193905625 + 27394756 = 13925^2 + 5234^2 .

It is a cyclic number.

It is not a de Polignac number, because 221300381 - 2¹⁰ = 221299357 is a prime.

It is a super-2 number, since 2×221300381² = 97947717261490322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221320381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110650190 + 110650191.

It is an arithmetic number, because the mean of its divisors is an integer number (110650191).

Almost surely, 2^221300381 is an apocalyptic number.

It is an amenable number.

221300381 is a deficient number, since it is larger than the sum of its proper divisors (1).

221300381 is an equidigital number, since it uses as much as digits as its factorization.

221300381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 221300381 is about 14876.1682230338. The cubic root of 221300381 is about 604.8681551370.

The spelling of 221300381 in words is "two hundred twenty-one million, three hundred thousand, three hundred eighty-one".