55040421 has 8 divisors (see below), whose sum is σ = 73760544. Its totient is φ = 36506960.

The previous prime is 55040411. The next prime is 55040429. The reversal of 55040421 is 12404055.

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 55040421 - 2⁵ = 55040389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55040429) 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, 45975 + ... + 47156.

It is an arithmetic number, because the mean of its divisors is an integer number (9220068).

Almost surely, 2^55040421 is an apocalyptic number.

It is an amenable number.

55040421 is a deficient number, since it is larger than the sum of its proper divisors (18720123).

55040421 is a wasteful number, since it uses less digits than its factorization.

55040421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93331.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 55040421 is about 7418.9231698408. The cubic root of 55040421 is about 380.3883863788.

Adding to 55040421 its reverse (12404055), we get a palindrome (67444476).

The spelling of 55040421 in words is "fifty-five million, forty thousand, four hundred twenty-one".