2101720570 has 8 divisors (see below), whose sum is σ = 3783097044. Its totient is φ = 840688224.

The previous prime is 2101720559. The next prime is 2101720601. The reversal of 2101720570 is 750271012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2077445241 + 24275329 = 45579^2 + 4927^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×2101720570⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105086019 + ... + 105086038.

Almost surely, 2^2101720570 is an apocalyptic number.

2101720570 is a deficient number, since it is larger than the sum of its proper divisors (1681376474).

2101720570 is a wasteful number, since it uses less digits than its factorization.

2101720570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210172064.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 2101720570 is about 45844.5260636425. The cubic root of 2101720570 is about 1280.9288038169.

Adding to 2101720570 its reverse (750271012), we get a palindrome (2851991582).

The spelling of 2101720570 in words is "two billion, one hundred one million, seven hundred twenty thousand, five hundred seventy".