55622421 has 12 divisors (see below), whose sum is σ = 80408172. Its totient is φ = 37051776.

The previous prime is 55622389. The next prime is 55622429. The reversal of 55622421 is 12422655.

55622421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 42380100 + 13242321 = 6510^2 + 3639^2 .

It is not a de Polignac number, because 55622421 - 2⁵ = 55622389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55622429) 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 11 ways as a sum of consecutive naturals, for example, 20475 + ... + 23031.

It is an arithmetic number, because the mean of its divisors is an integer number (6700681).

Almost surely, 2^55622421 is an apocalyptic number.

It is an amenable number.

55622421 is a deficient number, since it is larger than the sum of its proper divisors (24785751).

55622421 is a wasteful number, since it uses less digits than its factorization.

55622421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4980 (or 4977 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 55622421 is about 7458.0440465312. The cubic root of 55622421 is about 381.7244364626.

The spelling of 55622421 in words is "fifty-five million, six hundred twenty-two thousand, four hundred twenty-one".