221011121231 has 8 divisors (see below), whose sum is σ = 227801657424. Its totient is φ = 214295618880.

The previous prime is 221011121183. The next prime is 221011121249. The reversal of 221011121231 is 132121110122.

It is a happy number.

221011121231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221011121231 - 2⁶ = 221011121167 is a prime.

It is a super-2 number, since 2×221011121231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011123231) 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 7 ways as a sum of consecutive naturals, for example, 18752480 + ... + 18764261.

It is an arithmetic number, because the mean of its divisors is an integer number (28475207178).

Almost surely, 2^221011121231 is an apocalyptic number.

221011121231 is a deficient number, since it is larger than the sum of its proper divisors (6790536193).

221011121231 is a wasteful number, since it uses less digits than its factorization.

221011121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37516921.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221011121231 its reverse (132121110122), we get a palindrome (353132231353).

The spelling of 221011121231 in words is "two hundred twenty-one billion, eleven million, one hundred twenty-one thousand, two hundred thirty-one".