55342021 has 16 divisors (see below), whose sum is σ = 68342400. Its totient is φ = 44640960.

The previous prime is 55342019. The next prime is 55342039. The reversal of 55342021 is 12024355.

It is not a de Polignac number, because 55342021 - 2¹ = 55342019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55341983 and 55342001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55342081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1086 + ... + 10576.

It is an arithmetic number, because the mean of its divisors is an integer number (4271400).

Almost surely, 2^55342021 is an apocalyptic number.

It is an amenable number.

55342021 is a deficient number, since it is larger than the sum of its proper divisors (13000379).

55342021 is an equidigital number, since it uses as much as digits as its factorization.

55342021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9529 (or 9515 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55342021 is about 7439.2218006993. The cubic root of 55342021 is about 381.0819144030.

Adding to 55342021 its reverse (12024355), we get a palindrome (67366376).

The spelling of 55342021 in words is "fifty-five million, three hundred forty-two thousand, twenty-one".