1021201020109 has 4 divisors (see below), whose sum is σ = 1074948442240. Its totient is φ = 967453597980.

The previous prime is 1021201020107. The next prime is 1021201020143. The reversal of 1021201020109 is 9010201021201.

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 not a de Polignac number, because 1021201020109 - 2¹ = 1021201020107 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: 53747422111 = 1021201020109 / (1 + 0 + 2 + 1 + 2 + 0 + 1 + 0 + 2 + 0 + 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 (1021201020101) 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, 26873711037 + ... + 26873711074.

It is an arithmetic number, because the mean of its divisors is an integer number (268737110560).

Almost surely, 2^{1021201020109} is an apocalyptic number.

1021201020109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1021201020109 is a deficient number, since it is larger than the sum of its proper divisors (53747422131).

1021201020109 is an equidigital number, since it uses as much as digits as its factorization.

1021201020109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53747422130.

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

The spelling of 1021201020109 in words is "one trillion, twenty-one billion, two hundred one million, twenty thousand, one hundred nine".