221161061 has 4 divisors (see below), whose sum is σ = 241266624. Its totient is φ = 201055500.

The previous prime is 221161049. The next prime is 221161063. The reversal of 221161061 is 160161122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221161061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221161063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10052765 + ... + 10052786.

It is an arithmetic number, because the mean of its divisors is an integer number (60316656).

Almost surely, 2^221161061 is an apocalyptic number.

It is an amenable number.

221161061 is a deficient number, since it is larger than the sum of its proper divisors (20105563).

221161061 is a wasteful number, since it uses less digits than its factorization.

221161061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20105562.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 221161061 is about 14871.4848283552. The cubic root of 221161061 is about 604.7411965941.

The spelling of 221161061 in words is "two hundred twenty-one million, one hundred sixty-one thousand, sixty-one".