210021121000001 has 4 divisors (see below), whose sum is σ = 210021745984512. Its totient is φ = 210020496015492.

The previous prime is 210021120999953. The next prime is 210021121000043. The reversal of 210021121000001 is 100000121120012.

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 210021121000001 - 2¹⁴ = 210021120983617 is a prime.

It is a super-2 number, since 2×210021121000001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210021121000501) 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, 311987921 + ... + 312660366.

It is an arithmetic number, because the mean of its divisors is an integer number (52505436496128).

Almost surely, 2^{210021121000001} is an apocalyptic number.

It is an amenable number.

210021121000001 is a deficient number, since it is larger than the sum of its proper divisors (624984511).

210021121000001 is an equidigital number, since it uses as much as digits as its factorization.

210021121000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624984510.

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

Adding to 210021121000001 its reverse (100000121120012), we get a palindrome (310021242120013).

The spelling of 210021121000001 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty-one million, one", and thus it is an aban number.