2101231 has 4 divisors (see below), whose sum is σ = 2292264. Its totient is φ = 1910200.

The previous prime is 2101223. The next prime is 2101237. The reversal of 2101231 is 1321012.

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 2101231 - 2³ = 2101223 is a prime.

It is a super-2 number, since 2×2101231² = 8830343430722, which 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 (2101237) 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, 95500 + ... + 95521.

It is an arithmetic number, because the mean of its divisors is an integer number (573066).

2^2101231 is an apocalyptic number.

2101231 is a deficient number, since it is larger than the sum of its proper divisors (191033).

2101231 is a wasteful number, since it uses less digits than its factorization.

2101231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191032.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 2101231 is about 1449.5623477450. The cubic root of 2101231 is about 128.0829337215.

Adding to 2101231 its reverse (1321012), we get a palindrome (3422243).

It can be divided in two parts, 2101 and 231, that added together give a palindrome (2332).

The spelling of 2101231 in words is "two million, one hundred one thousand, two hundred thirty-one".