20210464621 has 2 divisors, whose sum is σ = 20210464622. Its totient is φ = 20210464620.

The previous prime is 20210464583. The next prime is 20210464657. The reversal of 20210464621 is 12646401202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19158435396 + 1052029225 = 138414^2 + 32435^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210464621 - 2⁷ = 20210464493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20210464621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210464321) 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, 10105232310 + 10105232311.

It is an arithmetic number, because the mean of its divisors is an integer number (10105232311).

Almost surely, 2^20210464621 is an apocalyptic number.

It is an amenable number.

20210464621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210464621 is an equidigital number, since it uses as much as digits as its factorization.

20210464621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 20210464621 its reverse (12646401202), we get a palindrome (32856865823).

The spelling of 20210464621 in words is "twenty billion, two hundred ten million, four hundred sixty-four thousand, six hundred twenty-one".