221948653 has 2 divisors, whose sum is σ = 221948654. Its totient is φ = 221948652.

The previous prime is 221948647. The next prime is 221948659. The reversal of 221948653 is 356849122.

It is a balanced prime because it is at equal distance from previous prime (221948647) and next prime (221948659).

It can be written as a sum of positive squares in only one way, i.e., 150258564 + 71690089 = 12258^2 + 8467^2 .

It is a cyclic number.

It is not a de Polignac number, because 221948653 - 2²¹ = 219851501 is a prime.

It is a super-2 number, since 2×221948653² = 98522409137028818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221948659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110974326 + 110974327.

It is an arithmetic number, because the mean of its divisors is an integer number (110974327).

Almost surely, 2^221948653 is an apocalyptic number.

It is an amenable number.

221948653 is a deficient number, since it is larger than the sum of its proper divisors (1).

221948653 is an equidigital number, since it uses as much as digits as its factorization.

221948653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 40.

The square root of 221948653 is about 14897.9412336067. The cubic root of 221948653 is about 605.4582080788.

The spelling of 221948653 in words is "two hundred twenty-one million, nine hundred forty-eight thousand, six hundred fifty-three".