2021100120001 has 4 divisors (see below), whose sum is σ = 2139988362372. Its totient is φ = 1902211877632.

The previous prime is 2021100119999. The next prime is 2021100120007. The reversal of 2021100120001 is 1000210011202.

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 1441918238401 + 579181881600 = 1200799^2 + 761040^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021100120001 - 2¹ = 2021100119999 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 2021100120001.

It is not an unprimeable number, because it can be changed into a prime (2021100120007) 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, 59444121160 + ... + 59444121193.

It is an arithmetic number, because the mean of its divisors is an integer number (534997090593).

Almost surely, 2^{2021100120001} is an apocalyptic number.

It is an amenable number.

2021100120001 is a deficient number, since it is larger than the sum of its proper divisors (118888242371).

2021100120001 is a wasteful number, since it uses less digits than its factorization.

2021100120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118888242370.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2021100120001 its reverse (1000210011202), we get a palindrome (3021310131203).

The spelling of 2021100120001 in words is "two trillion, twenty-one billion, one hundred million, one hundred twenty thousand, one".