61007421 has 8 divisors (see below), whose sum is σ = 81381184. Its totient is φ = 40652640.

The previous prime is 61007417. The next prime is 61007437. The reversal of 61007421 is 12470016.

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

It is not a de Polignac number, because 61007421 - 2² = 61007417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61007521) 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, 6705 + ... + 12921.

It is an arithmetic number, because the mean of its divisors is an integer number (10172648).

Almost surely, 2^61007421 is an apocalyptic number.

It is an amenable number.

61007421 is a deficient number, since it is larger than the sum of its proper divisors (20373763).

61007421 is a wasteful number, since it uses less digits than its factorization.

61007421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9491.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 61007421 is about 7810.7247423014. The cubic root of 61007421 is about 393.6656809119.

Adding to 61007421 its reverse (12470016), we get a palindrome (73477437).

The spelling of 61007421 in words is "sixty-one million, seven thousand, four hundred twenty-one".