210031113021 has 4 divisors (see below), whose sum is σ = 280041484032. Its totient is φ = 140020742012.

The previous prime is 210031112953. The next prime is 210031113023. The reversal of 210031113021 is 120311130012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210031113021 - 2¹¹ = 210031110973 is a prime.

It is a super-2 number, since 2×210031113021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210031113023) 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, 35005185501 + ... + 35005185506.

It is an arithmetic number, because the mean of its divisors is an integer number (70010371008).

Almost surely, 2^210031113021 is an apocalyptic number.

It is an amenable number.

210031113021 is a deficient number, since it is larger than the sum of its proper divisors (70010371011).

210031113021 is an equidigital number, since it uses as much as digits as its factorization.

210031113021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70010371010.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 210031113021 its reverse (120311130012), we get a palindrome (330342243033).

The spelling of 210031113021 in words is "two hundred ten billion, thirty-one million, one hundred thirteen thousand, twenty-one".