210121211021 has 8 divisors (see below), whose sum is σ = 219487008960. Its totient is φ = 200774587552.

The previous prime is 210121210997. The next prime is 210121211023. The reversal of 210121211021 is 120112121012.

210121211021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 210121211021 - 2¹⁰ = 210121209997 is a prime.

It is a super-2 number, since 2×210121211021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210121210987 and 210121211005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121211023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4771211 + ... + 4815048.

It is an arithmetic number, because the mean of its divisors is an integer number (27435876120).

Almost surely, 2^210121211021 is an apocalyptic number.

It is an amenable number.

210121211021 is a deficient number, since it is larger than the sum of its proper divisors (9365797939).

210121211021 is an equidigital number, since it uses as much as digits as its factorization.

210121211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9587235.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210121211021 its reverse (120112121012), we get a palindrome (330233332033).

Subtracting from 210121211021 its reverse (120112121012), we obtain a palindrome (90009090009).

The spelling of 210121211021 in words is "two hundred ten billion, one hundred twenty-one million, two hundred eleven thousand, twenty-one".