221031123031 has 4 divisors (see below), whose sum is σ = 221155090672. Its totient is φ = 220907155392.

The previous prime is 221031123017. The next prime is 221031123059. The reversal of 221031123031 is 130321130122.

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 221031123031 - 2¹¹ = 221031120983 is a prime.

It is a super-2 number, since 2×221031123031² (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 (221031123631) 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, 61981146 + ... + 61984711.

It is an arithmetic number, because the mean of its divisors is an integer number (55288772668).

Almost surely, 2^221031123031 is an apocalyptic number.

221031123031 is a deficient number, since it is larger than the sum of its proper divisors (123967641).

221031123031 is a wasteful number, since it uses less digits than its factorization.

221031123031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123967640.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 221031123031 its reverse (130321130122), we get a palindrome (351352253153).

It can be divided in two parts, 2210 and 31123031, that added together give a square (31125241 = 5579²).

The spelling of 221031123031 in words is "two hundred twenty-one billion, thirty-one million, one hundred twenty-three thousand, thirty-one".