210231210021 has 16 divisors (see below), whose sum is σ = 320359219200. Its totient is φ = 120129532848.

The previous prime is 210231210017. The next prime is 210231210061. The reversal of 210231210021 is 120012132012.

It is not a de Polignac number, because 210231210021 - 2² = 210231210017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210231210061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1347300 + ... + 1495218.

It is an arithmetic number, because the mean of its divisors is an integer number (20022451200).

Almost surely, 2^210231210021 is an apocalyptic number.

210231210021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210231210021 is a deficient number, since it is larger than the sum of its proper divisors (110128009179).

210231210021 is a wasteful number, since it uses less digits than its factorization.

210231210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215608.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 210231210021 its reverse (120012132012), we get a palindrome (330243342033).

The spelling of 210231210021 in words is "two hundred ten billion, two hundred thirty-one million, two hundred ten thousand, twenty-one".