61242421 has 2 divisors, whose sum is σ = 61242422. Its totient is φ = 61242420.

The previous prime is 61242409. The next prime is 61242439. The reversal of 61242421 is 12424216.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54967396 + 6275025 = 7414^2 + 2505^2 .

It is a cyclic number.

It is not a de Polignac number, because 61242421 - 2⁹ = 61241909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61242392 and 61242401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61242451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30621210 + 30621211.

It is an arithmetic number, because the mean of its divisors is an integer number (30621211).

Almost surely, 2^61242421 is an apocalyptic number.

It is an amenable number.

61242421 is a deficient number, since it is larger than the sum of its proper divisors (1).

61242421 is an equidigital number, since it uses as much as digits as its factorization.

61242421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 22.

The square root of 61242421 is about 7825.7537017210. The cubic root of 61242421 is about 394.1704987557.

Adding to 61242421 its reverse (12424216), we get a palindrome (73666637).

The spelling of 61242421 in words is "sixty-one million, two hundred forty-two thousand, four hundred twenty-one".