10212110021 has 4 divisors (see below), whose sum is σ = 10220287500. Its totient is φ = 10203932544.

The previous prime is 10212109961. The next prime is 10212110053. The reversal of 10212110021 is 12001121201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6814502500 + 3397607521 = 82550^2 + 58289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10212110021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10212109984 and 10212110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212110081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4086866 + ... + 4089363.

It is an arithmetic number, because the mean of its divisors is an integer number (2555071875).

Almost surely, 2^10212110021 is an apocalyptic number.

It is an amenable number.

10212110021 is a deficient number, since it is larger than the sum of its proper divisors (8177479).

10212110021 is an equidigital number, since it uses as much as digits as its factorization.

10212110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8177478.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10212110021 its reverse (12001121201), we get a palindrome (22213231222).

The spelling of 10212110021 in words is "ten billion, two hundred twelve million, one hundred ten thousand, twenty-one".