210021121001 has 32 divisors (see below), whose sum is σ = 229103271936. Its totient is φ = 191949120000.

The previous prime is 210021120989. The next prime is 210021121019. The reversal of 210021121001 is 100121120012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021121001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210021121201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17973881 + ... + 17985561.

It is an arithmetic number, because the mean of its divisors is an integer number (7159477248).

Almost surely, 2^210021121001 is an apocalyptic number.

It is an amenable number.

210021121001 is a deficient number, since it is larger than the sum of its proper divisors (19082150935).

210021121001 is a wasteful number, since it uses less digits than its factorization.

210021121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12053.

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

Adding to 210021121001 its reverse (100121120012), we get a palindrome (310142241013).

It can be divided in two parts, 2100211 and 21001, that added together give a palindrome (2121212).

The spelling of 210021121001 in words is "two hundred ten billion, twenty-one million, one hundred twenty-one thousand, one".