202100020621 has 2 divisors, whose sum is σ = 202100020622. Its totient is φ = 202100020620.

The previous prime is 202100020613. The next prime is 202100020643. The reversal of 202100020621 is 126020001202.

202100020621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126601467721 + 75498552900 = 355811^2 + 274770^2 .

It is a cyclic number.

It is not a de Polignac number, because 202100020621 - 2³ = 202100020613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202100020595 and 202100020604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202100020691) by changing a digit.

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 as a sum of consecutive naturals, namely, 101050010310 + 101050010311.

It is an arithmetic number, because the mean of its divisors is an integer number (101050010311).

Almost surely, 2^202100020621 is an apocalyptic number.

It is an amenable number.

202100020621 is a deficient number, since it is larger than the sum of its proper divisors (1).

202100020621 is an equidigital number, since it uses as much as digits as its factorization.

202100020621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 202100020621 its reverse (126020001202), we get a palindrome (328120021823).

The spelling of 202100020621 in words is "two hundred two billion, one hundred million, twenty thousand, six hundred twenty-one".