2021155205 has 8 divisors (see below), whose sum is σ = 2503624704. Its totient is φ = 1564765200.

The previous prime is 2021155193. The next prime is 2021155231. The reversal of 2021155205 is 5025511202.

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

It is not a de Polignac number, because 2021155205 - 2⁴ = 2021155189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6519701 + ... + 6520010.

It is an arithmetic number, because the mean of its divisors is an integer number (312953088).

Almost surely, 2^2021155205 is an apocalyptic number.

It is an amenable number.

2021155205 is a deficient number, since it is larger than the sum of its proper divisors (482469499).

2021155205 is a wasteful number, since it uses less digits than its factorization.

2021155205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13039747.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 2021155205 is about 44957.2597585751. The cubic root of 2021155205 is about 1264.3477929631.

Adding to 2021155205 its reverse (5025511202), we get a palindrome (7046666407).

The spelling of 2021155205 in words is "two billion, twenty-one million, one hundred fifty-five thousand, two hundred five".