213123031 has 8 divisors (see below), whose sum is σ = 233109504. Its totient is φ = 193238520.

The previous prime is 213122971. The next prime is 213123041. The reversal of 213123031 is 130321312.

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 213123031 - 2¹⁷ = 212991959 is a prime.

It is a super-2 number, since 2×213123031² = 90842852685253922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213122996 and 213123014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123041) 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, 21081 + ... + 29506.

It is an arithmetic number, because the mean of its divisors is an integer number (29138688).

Almost surely, 2^213123031 is an apocalyptic number.

213123031 is a deficient number, since it is larger than the sum of its proper divisors (19986473).

213123031 is a wasteful number, since it uses less digits than its factorization.

213123031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50981.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 213123031 is about 14598.7338834572. The cubic root of 213123031 is about 597.3242245970.

Adding to 213123031 its reverse (130321312), we get a palindrome (343444343).

The spelling of 213123031 in words is "two hundred thirteen million, one hundred twenty-three thousand, thirty-one".