210210210021 has 16 divisors (see below), whose sum is σ = 320384968704. Its totient is φ = 120095876784.

The previous prime is 210210210017. The next prime is 210210210029. The reversal of 210210210021 is 120012012012.

It is not a de Polignac number, because 210210210021 - 2² = 210210210017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210210209979 and 210210210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210210029) 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, 903345 + ... + 1111958.

It is an arithmetic number, because the mean of its divisors is an integer number (20024060544).

Almost surely, 2^210210210021 is an apocalyptic number.

210210210021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210210210021 is a deficient number, since it is larger than the sum of its proper divisors (110174758683).

210210210021 is a wasteful number, since it uses less digits than its factorization.

210210210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020280.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210210210021 its reverse (120012012012), we get a palindrome (330222222033).

The spelling of 210210210021 in words is "two hundred ten billion, two hundred ten million, two hundred ten thousand, twenty-one".