210031221423 has 4 divisors (see below), whose sum is σ = 280041628568. Its totient is φ = 140020814280.

The previous prime is 210031221341. The next prime is 210031221443. The reversal of 210031221423 is 324122130012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 210031221423 - 2⁹ = 210031220911 is a prime.

It is a super-2 number, since 2×210031221423² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210031221423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210031221443) 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, 35005203568 + ... + 35005203573.

It is an arithmetic number, because the mean of its divisors is an integer number (70010407142).

Almost surely, 2^210031221423 is an apocalyptic number.

210031221423 is a deficient number, since it is larger than the sum of its proper divisors (70010407145).

210031221423 is an equidigital number, since it uses as much as digits as its factorization.

210031221423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70010407144.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 210031221423 its reverse (324122130012), we get a palindrome (534153351435).

The spelling of 210031221423 in words is "two hundred ten billion, thirty-one million, two hundred twenty-one thousand, four hundred twenty-three".