61421 has 4 divisors (see below), whose sum is σ = 65052. Its totient is φ = 57792.

The previous prime is 61417. The next prime is 61441. The reversal of 61421 is 12416.

61421 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16900 + 44521 = 130^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 61421 - 2² = 61417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61396 and 61405.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 61421.

It is not an unprimeable number, because it can be changed into a prime (61441) 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, 1790 + ... + 1823.

It is an arithmetic number, because the mean of its divisors is an integer number (16263).

2⁶¹⁴²¹ is an apocalyptic number.

It is an amenable number.

61421 is a deficient number, since it is larger than the sum of its proper divisors (3631).

61421 is a wasteful number, since it uses less digits than its factorization.

61421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630.

The product of its digits is 48, while the sum is 14.

The square root of 61421 is about 247.8326047961. The cubic root of 61421 is about 39.4553252327.

Adding to 61421 its reverse (12416), we get a palindrome (73837).

The spelling of 61421 in words is "sixty-one thousand, four hundred twenty-one".