55315421 has 8 divisors (see below), whose sum is σ = 63777984. Its totient is φ = 46992960.

The previous prime is 55315417. The next prime is 55315423. The reversal of 55315421 is 12451355.

55315421 is nontrivially palindromic in base 6.

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

It is not a de Polignac number, because 55315421 - 2² = 55315417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55315423) 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, 34175 + ... + 35756.

It is an arithmetic number, because the mean of its divisors is an integer number (7972248).

Almost surely, 2^55315421 is an apocalyptic number.

It is an amenable number.

55315421 is a deficient number, since it is larger than the sum of its proper divisors (8462563).

55315421 is a wasteful number, since it uses less digits than its factorization.

55315421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70051.

The product of its digits is 3000, while the sum is 26.

The square root of 55315421 is about 7437.4337644109. The cubic root of 55315421 is about 381.0208492711.

Adding to 55315421 its reverse (12451355), we get a palindrome (67766776).

The spelling of 55315421 in words is "fifty-five million, three hundred fifteen thousand, four hundred twenty-one".