20055513221 has 4 divisors (see below), whose sum is σ = 20242948032. Its totient is φ = 19868078412.

The previous prime is 20055513119. The next prime is 20055513223. The reversal of 20055513221 is 12231555002.

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 20055513221 - 2¹⁴ = 20055496837 is a prime.

It is a super-2 number, since 2×20055513221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20055513223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93717245 + ... + 93717458.

It is an arithmetic number, because the mean of its divisors is an integer number (5060737008).

Almost surely, 2^20055513221 is an apocalyptic number.

It is an amenable number.

20055513221 is a deficient number, since it is larger than the sum of its proper divisors (187434811).

20055513221 is a wasteful number, since it uses less digits than its factorization.

20055513221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187434810.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 20055513221 in words is "twenty billion, fifty-five million, five hundred thirteen thousand, two hundred twenty-one".