55554821 has 16 divisors (see below), whose sum is σ = 68395008. Its totient is φ = 44074800.

The previous prime is 55554817. The next prime is 55554847. The reversal of 55554821 is 12845555.

It is not a de Polignac number, because 55554821 - 2² = 55554817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55556821) 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, 575 + ... + 10556.

It is an arithmetic number, because the mean of its divisors is an integer number (4274688).

Almost surely, 2^55554821 is an apocalyptic number.

It is an amenable number.

55554821 is a deficient number, since it is larger than the sum of its proper divisors (12840187).

55554821 is a wasteful number, since it uses less digits than its factorization.

55554821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11192.

The product of its digits is 40000, while the sum is 35.

The square root of 55554821 is about 7453.5106493518. The cubic root of 55554821 is about 381.5697324646.

The spelling of 55554821 in words is "fifty-five million, five hundred fifty-four thousand, eight hundred twenty-one".