221123523155 has 32 divisors (see below), whose sum is σ = 269311703040. Its totient is φ = 174280170240.

The previous prime is 221123523121. The next prime is 221123523161. The reversal of 221123523155 is 551325321122.

It is not a de Polignac number, because 221123523155 - 2¹⁴ = 221123506771 is a prime.

It is a super-2 number, since 2×221123523155² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74425820 + ... + 74428790.

It is an arithmetic number, because the mean of its divisors is an integer number (8415990720).

Almost surely, 2^221123523155 is an apocalyptic number.

221123523155 is a deficient number, since it is larger than the sum of its proper divisors (48188179885).

221123523155 is a wasteful number, since it uses less digits than its factorization.

221123523155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3899.

The product of its digits is 18000, while the sum is 32.

Adding to 221123523155 its reverse (551325321122), we get a palindrome (772448844277).

The spelling of 221123523155 in words is "two hundred twenty-one billion, one hundred twenty-three million, five hundred twenty-three thousand, one hundred fifty-five".