55202421 has 8 divisors (see below), whose sum is σ = 74255040. Its totient is φ = 36475712.

The previous prime is 55202419. The next prime is 55202423. The reversal of 55202421 is 12420255.

It is a happy number.

55202421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55202419) and next prime (55202423).

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 55202421 - 2¹ = 55202419 is a prime.

It is a super-2 number, since 2×55202421² = 6094614568522482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55202423) 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 7 ways as a sum of consecutive naturals, for example, 81081 + ... + 81758.

It is an arithmetic number, because the mean of its divisors is an integer number (9281880).

Almost surely, 2^55202421 is an apocalyptic number.

It is an amenable number.

55202421 is a deficient number, since it is larger than the sum of its proper divisors (19052619).

55202421 is a wasteful number, since it uses less digits than its factorization.

55202421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162955.

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

The square root of 55202421 is about 7429.8331744394. The cubic root of 55202421 is about 380.7612187934.

Adding to 55202421 its reverse (12420255), we get a palindrome (67622676).

The spelling of 55202421 in words is "fifty-five million, two hundred two thousand, four hundred twenty-one".