221012232031 has 4 divisors (see below), whose sum is σ = 221059899432. Its totient is φ = 220964564632.

The previous prime is 221012231983. The next prime is 221012232121. The reversal of 221012232031 is 130232210122.

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 221012232031 - 2¹⁹ = 221011707743 is a prime.

It is a super-2 number, since 2×221012232031² (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 (221010232031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23826745 + ... + 23836018.

It is an arithmetic number, because the mean of its divisors is an integer number (55264974858).

Almost surely, 2^221012232031 is an apocalyptic number.

221012232031 is a deficient number, since it is larger than the sum of its proper divisors (47667401).

221012232031 is an equidigital number, since it uses as much as digits as its factorization.

221012232031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47667400.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221012232031 its reverse (130232210122), we get a palindrome (351244442153).

The spelling of 221012232031 in words is "two hundred twenty-one billion, twelve million, two hundred thirty-two thousand, thirty-one".