20629020421 has 2 divisors, whose sum is σ = 20629020422. Its totient is φ = 20629020420.

The previous prime is 20629020403. The next prime is 20629020431. The reversal of 20629020421 is 12402092602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19631092321 + 997928100 = 140111^2 + 31590^2 .

It is a cyclic number.

It is not a de Polignac number, because 20629020421 - 2¹⁵ = 20628987653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20629020421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20629020431) 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, 10314510210 + 10314510211.

It is an arithmetic number, because the mean of its divisors is an integer number (10314510211).

Almost surely, 2^20629020421 is an apocalyptic number.

It is an amenable number.

20629020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629020421 is an equidigital number, since it uses as much as digits as its factorization.

20629020421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 20629020421 in words is "twenty billion, six hundred twenty-nine million, twenty thousand, four hundred twenty-one".