2021205045 has 16 divisors (see below), whose sum is σ = 3250688832. Its totient is φ = 1072389120.

The previous prime is 2021205029. The next prime is 2021205073. The reversal of 2021205045 is 5405021202.

It is a happy number.

It is not a de Polignac number, because 2021205045 - 2⁴ = 2021205029 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346191 + ... + 351980.

It is an arithmetic number, because the mean of its divisors is an integer number (203168052).

Almost surely, 2^2021205045 is an apocalyptic number.

It is an amenable number.

2021205045 is a deficient number, since it is larger than the sum of its proper divisors (1229483787).

2021205045 is a wasteful number, since it uses less digits than its factorization.

2021205045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698372.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 2021205045 is about 44957.8140594046. The cubic root of 2021205045 is about 1264.3581854647.

Adding to 2021205045 its reverse (5405021202), we get a palindrome (7426226247).

The spelling of 2021205045 in words is "two billion, twenty-one million, two hundred five thousand, forty-five".