210021010101 has 48 divisors (see below), whose sum is σ = 355255275648. Its totient is φ = 117052646400.

The previous prime is 210021010097. The next prime is 210021010117. The reversal of 210021010101 is 101010120012.

It is a happy number.

210021010101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210021010101 - 2² = 210021010097 is a prime.

It is a super-3 number, since 3×210021010101³ (a number of 35 digits) contains 333 as substring.

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 (210021018101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11772150 + ... + 11789976.

It is an arithmetic number, because the mean of its divisors is an integer number (7401151576).

Almost surely, 2^210021010101 is an apocalyptic number.

210021010101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210021010101 is a deficient number, since it is larger than the sum of its proper divisors (145234265547).

210021010101 is a wasteful number, since it uses less digits than its factorization.

210021010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22442 (or 22439 counting only the distinct ones).

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

Adding to 210021010101 its reverse (101010120012), we get a palindrome (311031130113).

The spelling of 210021010101 in words is "two hundred ten billion, twenty-one million, ten thousand, one hundred one".