2101020021109 has 4 divisors (see below), whose sum is σ = 2211600022240. Its totient is φ = 1990440019980.

The previous prime is 2101020021083. The next prime is 2101020021151. The reversal of 2101020021109 is 9011200201012.

It is a happy number.

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 2101020021109 - 2¹¹ = 2101020019061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 110580001111 = 2101020021109 / (2 + 1 + 0 + 1 + 0 + 2 + 0 + 0 + 2 + 1 + 1 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101020021809) 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, 55290000537 + ... + 55290000574.

It is an arithmetic number, because the mean of its divisors is an integer number (552900005560).

Almost surely, 2^{2101020021109} is an apocalyptic number.

It is an amenable number.

2101020021109 is a deficient number, since it is larger than the sum of its proper divisors (110580001131).

2101020021109 is a wasteful number, since it uses less digits than its factorization.

2101020021109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110580001130.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 2101020021109 in words is "two trillion, one hundred one billion, twenty million, twenty-one thousand, one hundred nine".