2021204212009 has 4 divisors (see below), whose sum is σ = 2021220004804. Its totient is φ = 2021188419216.

The previous prime is 2021204211973. The next prime is 2021204212033. The reversal of 2021204212009 is 9002124021202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1506007568025 + 515196643984 = 1227195^2 + 717772^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021204212009 - 2⁹ = 2021204211497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021204218009) 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, 7702842 + ... + 7960915.

It is an arithmetic number, because the mean of its divisors is an integer number (505305001201).

Almost surely, 2^{2021204212009} is an apocalyptic number.

It is an amenable number.

2021204212009 is a deficient number, since it is larger than the sum of its proper divisors (15792795).

2021204212009 is a wasteful number, since it uses less digits than its factorization.

2021204212009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15792794.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 2021204212009 in words is "two trillion, twenty-one billion, two hundred four million, two hundred twelve thousand, nine".