55205100021 has 8 divisors (see below), whose sum is σ = 74493629280. Its totient is φ = 36359985392.

The previous prime is 55205100019. The next prime is 55205100053. The reversal of 55205100021 is 12000150255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55205100021 - 2¹ = 55205100019 is a prime.

It is a super-2 number, since 2×55205100021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55205100011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110853366 + ... + 110853863.

It is an arithmetic number, because the mean of its divisors is an integer number (9311703660).

Almost surely, 2^55205100021 is an apocalyptic number.

It is an amenable number.

55205100021 is a deficient number, since it is larger than the sum of its proper divisors (19288529259).

55205100021 is a wasteful number, since it uses less digits than its factorization.

55205100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221707315.

The product of its (nonzero) digits is 500, while the sum is 21.

Adding to 55205100021 its reverse (12000150255), we get a palindrome (67205250276).

The spelling of 55205100021 in words is "fifty-five billion, two hundred five million, one hundred thousand, twenty-one".