20110231021 has 8 divisors (see below), whose sum is σ = 20230751360. Its totient is φ = 19990059552.

The previous prime is 20110230997. The next prime is 20110231049. The reversal of 20110231021 is 12013201102.

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

It is a cyclic number.

It is not a de Polignac number, because 20110231021 - 2⁷ = 20110230893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20110230992 and 20110231010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110271021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28876 + ... + 202618.

It is an arithmetic number, because the mean of its divisors is an integer number (2528843920).

Almost surely, 2^20110231021 is an apocalyptic number.

It is an amenable number.

20110231021 is a deficient number, since it is larger than the sum of its proper divisors (120520339).

20110231021 is a wasteful number, since it uses less digits than its factorization.

20110231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174435.

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

Adding to 20110231021 its reverse (12013201102), we get a palindrome (32123432123).

The spelling of 20110231021 in words is "twenty billion, one hundred ten million, two hundred thirty-one thousand, twenty-one".