210210121221021 has 56 divisors (see below), whose sum is σ = 328558981416960. Its totient is φ = 134276664924000.

The previous prime is 210210121220993. The next prime is 210210121221029. The reversal of 210210121221021 is 120122121012012.

210210121221021 is a `hidden beast` number, since 2 + 10 + 210 + 1 + 212 + 210 + 21 = 666.

It is not a de Polignac number, because 210210121221021 - 2⁵ = 210210121220989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210210121220985 and 210210121221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210121221029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 43765741 + ... + 48330738.

It is an arithmetic number, because the mean of its divisors is an integer number (5867124668160).

Almost surely, 2^{210210121221021} is an apocalyptic number.

It is an amenable number.

210210121221021 is a deficient number, since it is larger than the sum of its proper divisors (118348860195939).

210210121221021 is an equidigital number, since it uses as much as digits as its factorization.

210210121221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92096629 (or 92096614 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 210210121221021 its reverse (120122121012012), we get a palindrome (330332242233033).

The spelling of 210210121221021 in words is "two hundred ten trillion, two hundred ten billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty-one".