2021210101 has 4 divisors (see below), whose sum is σ = 2127589600. Its totient is φ = 1914830604.

The previous prime is 2021210099. The next prime is 2021210143. The reversal of 2021210101 is 1010121202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1010121202 = 2 ⋅505060601.

It is a cyclic number.

It is not a de Polignac number, because 2021210101 - 2¹ = 2021210099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021210161) 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, 53189721 + ... + 53189758.

It is an arithmetic number, because the mean of its divisors is an integer number (531897400).

Almost surely, 2^2021210101 is an apocalyptic number.

It is an amenable number.

2021210101 is a deficient number, since it is larger than the sum of its proper divisors (106379499).

2021210101 is a wasteful number, since it uses less digits than its factorization.

2021210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106379498.

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

The square root of 2021210101 is about 44957.8702898614. The cubic root of 2021210101 is about 1264.3592397185.

Adding to 2021210101 its reverse (1010121202), we get a palindrome (3031331303).

The spelling of 2021210101 in words is "two billion, twenty-one million, two hundred ten thousand, one hundred one".