231021011 has 8 divisors (see below), whose sum is σ = 253486800. Its totient is φ = 209225952.

The previous prime is 231020963. The next prime is 231021023. The reversal of 231021011 is 110120132.

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

It is not a de Polignac number, because 231021011 - 2²² = 226826707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231020983 and 231021001.

It is not an unprimeable number, because it can be changed into a prime (231021061) 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, 166961 + ... + 168338.

It is an arithmetic number, because the mean of its divisors is an integer number (31685850).

Almost surely, 2^231021011 is an apocalyptic number.

231021011 is a deficient number, since it is larger than the sum of its proper divisors (22465789).

231021011 is a wasteful number, since it uses less digits than its factorization.

231021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335365.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 231021011 is about 15199.3753490069. The cubic root of 231021011 is about 613.5978464520.

Adding to 231021011 its reverse (110120132), we get a palindrome (341141143).

The spelling of 231021011 in words is "two hundred thirty-one million, twenty-one thousand, eleven".