21101201010 has 48 divisors (see below), whose sum is σ = 56345918616. Its totient is φ = 5474905344.

The previous prime is 21101200997. The next prime is 21101201039. The reversal of 21101201010 is 1010210112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20981232801 + 119968209 = 144849^2 + 10953^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21101200983 and 21101201001.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3165019 + ... + 3171678.

Almost surely, 2^21101201010 is an apocalyptic number.

21101201010 is an abundant number, since it is smaller than the sum of its proper divisors (35244717606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21101201010 is a wasteful number, since it uses less digits than its factorization.

21101201010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336747 (or 6336744 counting only the distinct ones).

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

Adding to 21101201010 its reverse (1010210112), we get a palindrome (22111411122).

It can be divided in two parts, 21101 and 201010, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 21101201010 in words is "twenty-one billion, one hundred one million, two hundred one thousand, ten".