1210210101 has 12 divisors (see below), whose sum is σ = 1748624800. Its totient is φ = 806555880.

The previous prime is 1210210091. The next prime is 1210210151. The reversal of 1210210101 is 1010120121.

It is a happy number.

It is not a de Polignac number, because 1210210101 - 2¹⁷ = 1210079029 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 (1210210151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12450 + ... + 50748.

Almost surely, 2^1210210101 is an apocalyptic number.

It is an amenable number.

1210210101 is a deficient number, since it is larger than the sum of its proper divisors (538414699).

1210210101 is a wasteful number, since it uses less digits than its factorization.

1210210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41816 (or 41813 counting only the distinct ones).

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

The square root of 1210210101 is about 34788.0741203074. The cubic root of 1210210101 is about 1065.6639092566.

Adding to 1210210101 its reverse (1010120121), we get a palindrome (2220330222).

The spelling of 1210210101 in words is "one billion, two hundred ten million, two hundred ten thousand, one hundred one".