20630505421 has 2 divisors, whose sum is σ = 20630505422. Its totient is φ = 20630505420.

The previous prime is 20630505403. The next prime is 20630505439. The reversal of 20630505421 is 12450503602.

It is a balanced prime because it is at equal distance from previous prime (20630505403) and next prime (20630505439).

It can be written as a sum of positive squares in only one way, i.e., 16035156900 + 4595348521 = 126630^2 + 67789^2 .

It is a cyclic number.

It is not a de Polignac number, because 20630505421 - 2²³ = 20622116813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20630505421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20630505491) 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, 10315252710 + 10315252711.

It is an arithmetic number, because the mean of its divisors is an integer number (10315252711).

Almost surely, 2^20630505421 is an apocalyptic number.

It is an amenable number.

20630505421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20630505421 is an equidigital number, since it uses as much as digits as its factorization.

20630505421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 20630505421 in words is "twenty billion, six hundred thirty million, five hundred five thousand, four hundred twenty-one".