61000221 has 4 divisors (see below), whose sum is σ = 81333632. Its totient is φ = 40666812.

The previous prime is 61000207. The next prime is 61000229. The reversal of 61000221 is 12200016.

61000221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 61000221 - 2⁵ = 61000189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61000197 and 61000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61000229) 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 3 ways as a sum of consecutive naturals, for example, 10166701 + ... + 10166706.

It is an arithmetic number, because the mean of its divisors is an integer number (20333408).

Almost surely, 2^61000221 is an apocalyptic number.

It is an amenable number.

61000221 is a deficient number, since it is larger than the sum of its proper divisors (20333411).

61000221 is a wasteful number, since it uses less digits than its factorization.

61000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20333410.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 61000221 is about 7810.2638239691. The cubic root of 61000221 is about 393.6501937008.

Adding to 61000221 its reverse (12200016), we get a palindrome (73200237).

The spelling of 61000221 in words is "sixty-one million, two hundred twenty-one", and thus it is an aban number.