221200312013 has 4 divisors (see below), whose sum is σ = 221293216668. Its totient is φ = 221107407360.

The previous prime is 221200311967. The next prime is 221200312019. The reversal of 221200312013 is 310213002122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310213002122 = 2 ⋅155106501061.

It can be written as a sum of positive squares in 2 ways, for example, as 106277956009 + 114922356004 = 326003^2 + 339002^2 .

It is a cyclic number.

It is not a de Polignac number, because 221200312013 - 2⁶ = 221200311949 is a prime.

It is a super-2 number, since 2×221200312013² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221200311982 and 221200312000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200312019) 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, 46448756 + ... + 46453517.

It is an arithmetic number, because the mean of its divisors is an integer number (55323304167).

Almost surely, 2^221200312013 is an apocalyptic number.

It is an amenable number.

221200312013 is a deficient number, since it is larger than the sum of its proper divisors (92904655).

221200312013 is an equidigital number, since it uses as much as digits as its factorization.

221200312013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92904654.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 221200312013 its reverse (310213002122), we get a palindrome (531413314135).

The spelling of 221200312013 in words is "two hundred twenty-one billion, two hundred million, three hundred twelve thousand, thirteen".