210021012202121 has 4 divisors (see below), whose sum is σ = 210705119734032. Its totient is φ = 209336904670212.

The previous prime is 210021012202063. The next prime is 210021012202123. The reversal of 210021012202121 is 121202210120012.

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 not a de Polignac number, because 210021012202121 - 2⁴⁶ = 139652268024457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 210021012202121.

It is not an unprimeable number, because it can be changed into a prime (210021012202123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342053765495 + ... + 342053766108.

It is an arithmetic number, because the mean of its divisors is an integer number (52676279933508).

Almost surely, 2^{210021012202121} is an apocalyptic number.

It is an amenable number.

210021012202121 is a deficient number, since it is larger than the sum of its proper divisors (684107531911).

210021012202121 is an equidigital number, since it uses as much as digits as its factorization.

210021012202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684107531910.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210021012202121 its reverse (121202210120012), we get a palindrome (331223222322133).

The spelling of 210021012202121 in words is "two hundred ten trillion, twenty-one billion, twelve million, two hundred two thousand, one hundred twenty-one".