55231421 has 8 divisors (see below), whose sum is σ = 63540864. Its totient is φ = 47026800.

The previous prime is 55231373. The next prime is 55231433. The reversal of 55231421 is 12413255.

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 55231421 - 2¹⁴ = 55215037 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 (55231471) 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, 25070 + ... + 27183.

It is an arithmetic number, because the mean of its divisors is an integer number (7942608).

Almost surely, 2^55231421 is an apocalyptic number.

It is an amenable number.

55231421 is a deficient number, since it is larger than the sum of its proper divisors (8309443).

55231421 is a wasteful number, since it uses less digits than its factorization.

55231421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52411.

The product of its digits is 1200, while the sum is 23.

The square root of 55231421 is about 7431.7845097931. The cubic root of 55231421 is about 380.8278833955.

Adding to 55231421 its reverse (12413255), we get a palindrome (67644676).

The spelling of 55231421 in words is "fifty-five million, two hundred thirty-one thousand, four hundred twenty-one".