20031021231 has 8 divisors (see below), whose sum is σ = 28762492080. Its totient is φ = 12326782272.

The previous prime is 20031021211. The next prime is 20031021271. The reversal of 20031021231 is 13212013002.

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

It is not a de Polignac number, because 20031021231 - 2⁶ = 20031021167 is a prime.

It is a super-2 number, since 2×20031021231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20031021231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031021211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256807926 + ... + 256808003.

It is an arithmetic number, because the mean of its divisors is an integer number (3595311510).

Almost surely, 2^20031021231 is an apocalyptic number.

20031021231 is a deficient number, since it is larger than the sum of its proper divisors (8731470849).

20031021231 is a wasteful number, since it uses less digits than its factorization.

20031021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513615945.

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

Adding to 20031021231 its reverse (13212013002), we get a palindrome (33243034233).

The spelling of 20031021231 in words is "twenty billion, thirty-one million, twenty-one thousand, two hundred thirty-one".