221542554530211 has 4 divisors (see below), whose sum is σ = 295390072706952. Its totient is φ = 147695036353472.

The previous prime is 221542554530177. The next prime is 221542554530243. The reversal of 221542554530211 is 112035455245122.

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 221542554530211 - 2²⁵ = 221542520975779 is a prime.

It is a super-2 number, since 2×221542554530211² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221542554530261) 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, 36923759088366 + ... + 36923759088371.

It is an arithmetic number, because the mean of its divisors is an integer number (73847518176738).

Almost surely, 2^{221542554530211} is an apocalyptic number.

221542554530211 is a deficient number, since it is larger than the sum of its proper divisors (73847518176741).

221542554530211 is an equidigital number, since it uses as much as digits as its factorization.

221542554530211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73847518176740.

The product of its (nonzero) digits is 480000, while the sum is 42.

The spelling of 221542554530211 in words is "two hundred twenty-one trillion, five hundred forty-two billion, five hundred fifty-four million, five hundred thirty thousand, two hundred eleven".