210101001021001 has 4 divisors (see below), whose sum is σ = 212181208952004. Its totient is φ = 208020793090000.

The previous prime is 210101001020993. The next prime is 210101001021089. The reversal of 210101001021001 is 100120100101012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 199701440243776 + 10399560777225 = 14131576^2 + 3224835^2 .

It is a cyclic number.

It is not a de Polignac number, because 210101001021001 - 2³ = 210101001020993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210101001021701) 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, 1040103965350 + ... + 1040103965551.

It is an arithmetic number, because the mean of its divisors is an integer number (53045302238001).

Almost surely, 2^{210101001021001} is an apocalyptic number.

It is an amenable number.

210101001021001 is a deficient number, since it is larger than the sum of its proper divisors (2080207931003).

210101001021001 is a wasteful number, since it uses less digits than its factorization.

210101001021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080207931002.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 210101001021001 its reverse (100120100101012), we get a palindrome (310221101122013).

The spelling of 210101001021001 in words is "two hundred ten trillion, one hundred one billion, one million, twenty-one thousand, one".