221153641 has 2 divisors, whose sum is σ = 221153642. Its totient is φ = 221153640.

The previous prime is 221153633. The next prime is 221153657. The reversal of 221153641 is 146351122.

It is a happy number.

221153641 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., 219899241 + 1254400 = 14829^2 + 1120^2 .

It is a cyclic number.

It is not a de Polignac number, because 221153641 - 2³ = 221153633 is a prime.

It is not a weakly prime, because it can be changed into another prime (221153041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110576820 + 110576821.

It is an arithmetic number, because the mean of its divisors is an integer number (110576821).

Almost surely, 2^221153641 is an apocalyptic number.

It is an amenable number.

221153641 is a deficient number, since it is larger than the sum of its proper divisors (1).

221153641 is an equidigital number, since it uses as much as digits as its factorization.

221153641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 221153641 is about 14871.2353555446. The cubic root of 221153641 is about 604.7344334538.

The spelling of 221153641 in words is "two hundred twenty-one million, one hundred fifty-three thousand, six hundred forty-one".