61221433 has 18 divisors (see below), whose sum is σ = 77126814. Its totient is φ = 48432384.

The previous prime is 61221389. The next prime is 61221443. The reversal of 61221433 is 33412216.

61221433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 2039184 + 59182249 = 1428^2 + 7693^2 .

It is not a de Polignac number, because 61221433 - 2⁹ = 61220921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61221443) 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 17 ways as a sum of consecutive naturals, for example, 4585 + ... + 11977.

It is an arithmetic number, because the mean of its divisors is an integer number (4284823).

Almost surely, 2^61221433 is an apocalyptic number.

It is an amenable number.

61221433 is a deficient number, since it is larger than the sum of its proper divisors (15905381).

61221433 is a wasteful number, since it uses less digits than its factorization.

61221433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7433 (or 7413 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 61221433 is about 7824.4126297122. The cubic root of 61221433 is about 394.1254657240.

Adding to 61221433 its reverse (33412216), we get a palindrome (94633649).

The spelling of 61221433 in words is "sixty-one million, two hundred twenty-one thousand, four hundred thirty-three".