61404221 has 8 divisors (see below), whose sum is σ = 65094840. Its totient is φ = 57722368.

The previous prime is 61404209. The next prime is 61404229. The reversal of 61404221 is 12240416.

It can be written as a sum of positive squares in 4 ways, for example, as 9765625 + 51638596 = 3125^2 + 7186^2 .

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 61404221 - 2¹⁸ = 61142077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61404193 and 61404202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61404229) 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, 17225 + ... + 20481.

It is an arithmetic number, because the mean of its divisors is an integer number (8136855).

Almost surely, 2^61404221 is an apocalyptic number.

It is an amenable number.

61404221 is a deficient number, since it is larger than the sum of its proper divisors (3690619).

61404221 is a wasteful number, since it uses less digits than its factorization.

61404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4383.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 61404221 is about 7836.0845452305. The cubic root of 61404221 is about 394.5173210112.

Adding to 61404221 its reverse (12240416), we get a palindrome (73644637).

The spelling of 61404221 in words is "sixty-one million, four hundred four thousand, two hundred twenty-one".