221123031 has 16 divisors (see below), whose sum is σ = 304739328. Its totient is φ = 142473600.

The previous prime is 221123017. The next prime is 221123047. The reversal of 221123031 is 130321122.

It is not a de Polignac number, because 221123031 - 2¹¹ = 221120983 is a prime.

It is a super-2 number, since 2×221123031² = 97790789677253922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221123031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221123011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125700 + ... + 127446.

It is an arithmetic number, because the mean of its divisors is an integer number (19046208).

Almost surely, 2^221123031 is an apocalyptic number.

221123031 is a deficient number, since it is larger than the sum of its proper divisors (83616297).

221123031 is a wasteful number, since it uses less digits than its factorization.

221123031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221123031 is about 14870.2061518998. The cubic root of 221123031 is about 604.7065316220.

Adding to 221123031 its reverse (130321122), we get a palindrome (351444153).

The spelling of 221123031 in words is "two hundred twenty-one million, one hundred twenty-three thousand, thirty-one".