221690241 has 12 divisors (see below), whose sum is σ = 327666768. Its totient is φ = 144356184.

The previous prime is 221690237. The next prime is 221690257. The reversal of 221690241 is 142096122.

221690241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221690241 - 2² = 221690237 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221690201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286035 + ... + 286808.

It is an arithmetic number, because the mean of its divisors is an integer number (27305564).

Almost surely, 2^221690241 is an apocalyptic number.

It is an amenable number.

221690241 is a deficient number, since it is larger than the sum of its proper divisors (105976527).

221690241 is a wasteful number, since it uses less digits than its factorization.

221690241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572892 (or 572889 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 221690241 is about 14889.2659657889. The cubic root of 221690241 is about 605.2231410573.

The spelling of 221690241 in words is "two hundred twenty-one million, six hundred ninety thousand, two hundred forty-one".