221061797 has 16 divisors (see below), whose sum is σ = 244394304. Its totient is φ = 199940400.

The previous prime is 221061773. The next prime is 221061811. The reversal of 221061797 is 797160122.

It is not a de Polignac number, because 221061797 - 2⁶ = 221061733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221061097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408347 + ... + 408887.

It is an arithmetic number, because the mean of its divisors is an integer number (15274644).

Almost surely, 2^221061797 is an apocalyptic number.

It is an amenable number.

221061797 is a deficient number, since it is larger than the sum of its proper divisors (23332507).

221061797 is an equidigital number, since it uses as much as digits as its factorization.

221061797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 221061797 is about 14868.1470600744. The cubic root of 221061797 is about 604.6507074681.

The spelling of 221061797 in words is "two hundred twenty-one million, sixty-one thousand, seven hundred ninety-seven".