210021102121 has 4 divisors (see below), whose sum is σ = 210039295744. Its totient is φ = 210002908500.

The previous prime is 210021102113. The next prime is 210021102157. The reversal of 210021102121 is 121201120012.

210021102121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 210021102121 - 2³ = 210021102113 is a prime.

It is a super-2 number, since 2×210021102121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210021102191) 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 3 ways as a sum of consecutive naturals, for example, 9079485 + ... + 9102586.

It is an arithmetic number, because the mean of its divisors is an integer number (52509823936).

Almost surely, 2^210021102121 is an apocalyptic number.

It is an amenable number.

210021102121 is a deficient number, since it is larger than the sum of its proper divisors (18193623).

210021102121 is a wasteful number, since it uses less digits than its factorization.

210021102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18193622.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210021102121 its reverse (121201120012), we get a palindrome (331222222133).

The spelling of 210021102121 in words is "two hundred ten billion, twenty-one million, one hundred two thousand, one hundred twenty-one".