1210000021101 has 24 divisors (see below), whose sum is σ = 1795255692984. Its totient is φ = 784759656960.

The previous prime is 1210000021003. The next prime is 1210000021151. The reversal of 1210000021101 is 1011200000121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 248727623076 + 961272398025 = 498726^2 + 980445^2 .

It is not a de Polignac number, because 1210000021101 - 2⁷ = 1210000020973 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 (1210000021151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2283361 + ... + 2762921.

It is an arithmetic number, because the mean of its divisors is an integer number (74802320541).

Almost surely, 2^{1210000021101} is an apocalyptic number.

It is an amenable number.

1210000021101 is a deficient number, since it is larger than the sum of its proper divisors (585255671883).

1210000021101 is a wasteful number, since it uses less digits than its factorization.

1210000021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487181 (or 487178 counting only the distinct ones).

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

Adding to 1210000021101 its reverse (1011200000121), we get a palindrome (2221200021222).

The spelling of 1210000021101 in words is "one trillion, two hundred ten billion, twenty-one thousand, one hundred one".