221100012031 has 4 divisors (see below), whose sum is σ = 221182422472. Its totient is φ = 221017601592.

The previous prime is 221100012019. The next prime is 221100012047. The reversal of 221100012031 is 130210001122.

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 221100012031 - 2¹⁷ = 221099880959 is a prime.

It is a super-2 number, since 2×221100012031² (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 (221100312031) 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, 41201196 + ... + 41206561.

It is an arithmetic number, because the mean of its divisors is an integer number (55295605618).

Almost surely, 2^221100012031 is an apocalyptic number.

221100012031 is a deficient number, since it is larger than the sum of its proper divisors (82410441).

221100012031 is an equidigital number, since it uses as much as digits as its factorization.

221100012031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82410440.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 221100012031 its reverse (130210001122), we get a palindrome (351310013153).

The spelling of 221100012031 in words is "two hundred twenty-one billion, one hundred million, twelve thousand, thirty-one".