210210101021 has 4 divisors (see below), whose sum is σ = 210363877152. Its totient is φ = 210056324892.

The previous prime is 210210101011. The next prime is 210210101069. The reversal of 210210101021 is 120101012012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210210101021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210210100993 and 210210101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210101011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76886015 + ... + 76888748.

It is an arithmetic number, because the mean of its divisors is an integer number (52590969288).

Almost surely, 2^210210101021 is an apocalyptic number.

It is an amenable number.

210210101021 is a deficient number, since it is larger than the sum of its proper divisors (153776131).

210210101021 is a wasteful number, since it uses less digits than its factorization.

210210101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153776130.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210210101021 its reverse (120101012012), we get a palindrome (330311113033).

The spelling of 210210101021 in words is "two hundred ten billion, two hundred ten million, one hundred one thousand, twenty-one".