55212202021 has 4 divisors (see below), whose sum is σ = 55633669344. Its totient is φ = 54790734700.

The previous prime is 55212201997. The next prime is 55212202037. The reversal of 55212202021 is 12020221255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55212202021 - 2³¹ = 53064718373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55212201983 and 55212202001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55212203021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210733465 + ... + 210733726.

It is an arithmetic number, because the mean of its divisors is an integer number (13908417336).

Almost surely, 2^55212202021 is an apocalyptic number.

It is an amenable number.

55212202021 is a deficient number, since it is larger than the sum of its proper divisors (421467323).

55212202021 is a wasteful number, since it uses less digits than its factorization.

55212202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421467322.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 55212202021 its reverse (12020221255), we get a palindrome (67232423276).

The spelling of 55212202021 in words is "fifty-five billion, two hundred twelve million, two hundred two thousand, twenty-one".