221201154553 has 4 divisors (see below), whose sum is σ = 221208779088. Its totient is φ = 221193530020.

The previous prime is 221201154539. The next prime is 221201154583. The reversal of 221201154553 is 355451102122.

221201154553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221201154553 - 2¹⁷ = 221201023481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221201154583) 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, 3768583 + ... + 3826828.

It is an arithmetic number, because the mean of its divisors is an integer number (55302194772).

Almost surely, 2^221201154553 is an apocalyptic number.

It is an amenable number.

221201154553 is a deficient number, since it is larger than the sum of its proper divisors (7624535).

221201154553 is an equidigital number, since it uses as much as digits as its factorization.

221201154553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7624534.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 221201154553 its reverse (355451102122), we get a palindrome (576652256675).

The spelling of 221201154553 in words is "two hundred twenty-one billion, two hundred one million, one hundred fifty-four thousand, five hundred fifty-three".