61012221 has 8 divisors (see below), whose sum is σ = 82330080. Its totient is φ = 40184592.

The previous prime is 61012219. The next prime is 61012229. The reversal of 61012221 is 12221016.

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

It is not a de Polignac number, because 61012221 - 2¹ = 61012219 is a prime.

It is a super-2 number, since 2×61012221² = 7444982222705682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61012229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122266 + ... + 122763.

It is an arithmetic number, because the mean of its divisors is an integer number (10291260).

Almost surely, 2^61012221 is an apocalyptic number.

It is an amenable number.

61012221 is a deficient number, since it is larger than the sum of its proper divisors (21317859).

61012221 is a wasteful number, since it uses less digits than its factorization.

61012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245115.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 61012221 is about 7811.0320060796. The cubic root of 61012221 is about 393.6760050423.

Adding to 61012221 its reverse (12221016), we get a palindrome (73233237).

The spelling of 61012221 in words is "sixty-one million, twelve thousand, two hundred twenty-one".