55986021 has 48 divisors (see below), whose sum is σ = 100324224. Its totient is φ = 29296512.

The previous prime is 55986013. The next prime is 55986023. The reversal of 55986021 is 12068955.

It is a happy number.

55986021 is a `hidden beast` number, since 5 + 598 + 60 + 2 + 1 = 666.

It is not a de Polignac number, because 55986021 - 2³ = 55986013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55986023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161170 + ... + 161516.

It is an arithmetic number, because the mean of its divisors is an integer number (2090088).

Almost surely, 2^55986021 is an apocalyptic number.

It is an amenable number.

55986021 is a deficient number, since it is larger than the sum of its proper divisors (44338203).

55986021 is a wasteful number, since it uses less digits than its factorization.

55986021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 55986021 is about 7482.3807040273. The cubic root of 55986021 is about 382.5543995421.

The spelling of 55986021 in words is "fifty-five million, nine hundred eighty-six thousand, twenty-one".