2021021101 has 4 divisors (see below), whose sum is σ = 2204750304. Its totient is φ = 1837291900.

The previous prime is 2021021087. The next prime is 2021021111. The reversal of 2021021101 is 1011201202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021021101 - 2⁷ = 2021020973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021021111) 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, 91864585 + ... + 91864606.

It is an arithmetic number, because the mean of its divisors is an integer number (551187576).

Almost surely, 2^2021021101 is an apocalyptic number.

It is an amenable number.

2021021101 is a deficient number, since it is larger than the sum of its proper divisors (183729203).

2021021101 is a wasteful number, since it uses less digits than its factorization.

2021021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183729202.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2021021101 is about 44955.7682728257. The cubic root of 2021021101 is about 1264.3198291125.

Adding to 2021021101 its reverse (1011201202), we get a palindrome (3032222303).

It can be divided in two parts, 202102 and 1101, that added together give a triangular number (203203 = T₆₃₇).

The spelling of 2021021101 in words is "two billion, twenty-one million, twenty-one thousand, one hundred one".