55021405 has 32 divisors (see below), whose sum is σ = 72186624. Its totient is φ = 40144896.

The previous prime is 55021403. The next prime is 55021423. The reversal of 55021405 is 50412055.

It is a cyclic number.

It is not a de Polignac number, because 55021405 - 2¹ = 55021403 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 (55021403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284989 + ... + 285181.

It is an arithmetic number, because the mean of its divisors is an integer number (2255832).

Almost surely, 2^55021405 is an apocalyptic number.

It is an amenable number.

55021405 is a deficient number, since it is larger than the sum of its proper divisors (17165219).

55021405 is a wasteful number, since it uses less digits than its factorization.

55021405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 55021405 is about 7417.6414715191. The cubic root of 55021405 is about 380.3445743426.

The spelling of 55021405 in words is "fifty-five million, twenty-one thousand, four hundred five".