210001002121221 has 128 divisors (see below), whose sum is σ = 300303059696640. Its totient is φ = 130282061414400.

The previous prime is 210001002121159. The next prime is 210001002121283. The reversal of 210001002121221 is 122121200100012.

210001002121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (210001002121159) and next prime (210001002121283).

It is not a de Polignac number, because 210001002121221 - 2¹¹ = 210001002119173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210001002121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001002126221) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 135222795181 + ... + 135222796733.

It is an arithmetic number, because the mean of its divisors is an integer number (2346117653880).

Almost surely, 2^{210001002121221} is an apocalyptic number.

It is an amenable number.

210001002121221 is a deficient number, since it is larger than the sum of its proper divisors (90302057575419).

210001002121221 is a wasteful number, since it uses less digits than its factorization.

210001002121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210001002121221 its reverse (122121200100012), we get a palindrome (332122202221233).

The spelling of 210001002121221 in words is "two hundred ten trillion, one billion, two million, one hundred twenty-one thousand, two hundred twenty-one".