2021020101 has 24 divisors (see below), whose sum is σ = 3075712640. Its totient is φ = 1275264000.

The previous prime is 2021020091. The next prime is 2021020147. The reversal of 2021020101 is 1010201202.

It is not a de Polignac number, because 2021020101 - 2¹⁵ = 2020987333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021020171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 205701 + ... + 215301.

Almost surely, 2^2021020101 is an apocalyptic number.

It is an amenable number.

2021020101 is a deficient number, since it is larger than the sum of its proper divisors (1054692539).

2021020101 is a wasteful number, since it uses less digits than its factorization.

2021020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10857 (or 10854 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2021020101 is about 44955.7571507810. The cubic root of 2021020101 is about 1264.3196205842.

Adding to 2021020101 its reverse (1010201202), we get a palindrome (3031221303).

The spelling of 2021020101 in words is "two billion, twenty-one million, twenty thousand, one hundred one".