221045555311 has 4 divisors (see below), whose sum is σ = 252623491792. Its totient is φ = 189467618832.

The previous prime is 221045555279. The next prime is 221045555317. The reversal of 221045555311 is 113555540122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221045555311 - 2⁵ = 221045555279 is a prime.

It is a super-2 number, since 2×221045555311² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221045555317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15788968230 + ... + 15788968243.

It is an arithmetic number, because the mean of its divisors is an integer number (63155872948).

Almost surely, 2^221045555311 is an apocalyptic number.

221045555311 is a deficient number, since it is larger than the sum of its proper divisors (31577936481).

221045555311 is an equidigital number, since it uses as much as digits as its factorization.

221045555311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31577936480.

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 221045555311 in words is "two hundred twenty-one billion, forty-five million, five hundred fifty-five thousand, three hundred eleven".