2101021057 has 4 divisors (see below), whose sum is σ = 2103338416. Its totient is φ = 2098703700.

The previous prime is 2101021049. The next prime is 2101021073. The reversal of 2101021057 is 7501201012.

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 2101021057 - 2³ = 2101021049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101021157) 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, 1157319 + ... + 1159132.

It is an arithmetic number, because the mean of its divisors is an integer number (525834604).

Almost surely, 2^2101021057 is an apocalyptic number.

It is an amenable number.

2101021057 is a deficient number, since it is larger than the sum of its proper divisors (2317359).

2101021057 is an equidigital number, since it uses as much as digits as its factorization.

2101021057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317358.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 2101021057 is about 45836.8962409106. The cubic root of 2101021057 is about 1280.7866780765.

Adding to 2101021057 its reverse (7501201012), we get a palindrome (9602222069).

The spelling of 2101021057 in words is "two billion, one hundred one million, twenty-one thousand, fifty-seven".