2021129011 has 4 divisors (see below), whose sum is σ = 2204868024. Its totient is φ = 1837390000.

The previous prime is 2021128951. The next prime is 2021129017. The reversal of 2021129011 is 1109211202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2021129011 - 2⁷ = 2021128883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021129011.

It is not an unprimeable number, because it can be changed into a prime (2021129017) 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, 91869490 + ... + 91869511.

It is an arithmetic number, because the mean of its divisors is an integer number (551217006).

Almost surely, 2^2021129011 is an apocalyptic number.

2021129011 is a deficient number, since it is larger than the sum of its proper divisors (183739013).

2021129011 is a wasteful number, since it uses less digits than its factorization.

2021129011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183739012.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 2021129011 is about 44956.9684364949. The cubic root of 2021129011 is about 1264.3423309928.

The spelling of 2021129011 in words is "two billion, twenty-one million, one hundred twenty-nine thousand, eleven".