210101020101 has 32 divisors (see below), whose sum is σ = 361755878400. Its totient is φ = 118022842800.

The previous prime is 210101020099. The next prime is 210101020109. The reversal of 210101020101 is 101020101012.

It is a happy number.

It is not a de Polignac number, because 210101020101 - 2¹ = 210101020099 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101020109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9409575 + ... + 9431876.

It is an arithmetic number, because the mean of its divisors is an integer number (11304871200).

Almost surely, 2^210101020101 is an apocalyptic number.

210101020101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210101020101 is a deficient number, since it is larger than the sum of its proper divisors (151654858299).

210101020101 is a wasteful number, since it uses less digits than its factorization.

210101020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18841526 (or 18841520 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 210101020101 its reverse (101020101012), we get a palindrome (311121121113).

The spelling of 210101020101 in words is "two hundred ten billion, one hundred one million, twenty thousand, one hundred one".