210021122002121 has 8 divisors (see below), whose sum is σ = 219152931376320. Its totient is φ = 200889350648272.

The previous prime is 210021122002103. The next prime is 210021122002231. The reversal of 210021122002121 is 121200221120012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021122002121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210021122002121.

It is not an unprimeable number, because it can be changed into a prime (210021122002721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2083550 + ... + 20600568.

It is an arithmetic number, because the mean of its divisors is an integer number (27394116422040).

Almost surely, 2^{210021122002121} is an apocalyptic number.

It is an amenable number.

210021122002121 is a deficient number, since it is larger than the sum of its proper divisors (9131809374199).

210021122002121 is a wasteful number, since it uses less digits than its factorization.

210021122002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19010175.

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

Adding to 210021122002121 its reverse (121200221120012), we get a palindrome (331221343122133).

The spelling of 210021122002121 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty-two million, two thousand, one hundred twenty-one".