10212100621 has 2 divisors, whose sum is σ = 10212100622. Its totient is φ = 10212100620.

The previous prime is 10212100589. The next prime is 10212100649. The reversal of 10212100621 is 12600121201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10198778121 + 13322500 = 100989^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212100621 - 2⁵ = 10212100589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10212100595 and 10212100604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10212400621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106050310 + 5106050311.

It is an arithmetic number, because the mean of its divisors is an integer number (5106050311).

Almost surely, 2^10212100621 is an apocalyptic number.

It is an amenable number.

10212100621 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212100621 is an equidigital number, since it uses as much as digits as its factorization.

10212100621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 10212100621 its reverse (12600121201), we get a palindrome (22812221822).

The spelling of 10212100621 in words is "ten billion, two hundred twelve million, one hundred thousand, six hundred twenty-one".