21300020351 has 2 divisors, whose sum is σ = 21300020352. Its totient is φ = 21300020350.

The previous prime is 21300020323. The next prime is 21300020387. The reversal of 21300020351 is 15302000312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21300020351 - 2²² = 21295826047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21300040351) 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, 10650010175 + 10650010176.

It is an arithmetic number, because the mean of its divisors is an integer number (10650010176).

Almost surely, 2^21300020351 is an apocalyptic number.

21300020351 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300020351 is an equidigital number, since it uses as much as digits as its factorization.

21300020351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

Adding to 21300020351 its reverse (15302000312), we get a palindrome (36602020663).

The spelling of 21300020351 in words is "twenty-one billion, three hundred million, twenty thousand, three hundred fifty-one".