221261081 has 8 divisors (see below), whose sum is σ = 231181440. Its totient is φ = 211365792.

The previous prime is 221261077. The next prime is 221261083. The reversal of 221261081 is 180162122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221261081 - 2² = 221261077 is a prime.

It is a super-2 number, since 2×221261081² = 97912931930577122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221261083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13085 + ... + 24773.

It is an arithmetic number, because the mean of its divisors is an integer number (28897680).

Almost surely, 2^221261081 is an apocalyptic number.

It is an amenable number.

221261081 is a deficient number, since it is larger than the sum of its proper divisors (9920359).

221261081 is a wasteful number, since it uses less digits than its factorization.

221261081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12535.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 221261081 is about 14874.8472597200. The cubic root of 221261081 is about 604.8323475080.

The spelling of 221261081 in words is "two hundred twenty-one million, two hundred sixty-one thousand, eighty-one".