21000020219963 has 2 divisors, whose sum is σ = 21000020219964. Its totient is φ = 21000020219962.

The previous prime is 21000020219923. The next prime is 21000020220059. The reversal of 21000020219963 is 36991202000012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000020219963 - 2³⁴ = 20982840350779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21000020219923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500010109981 + 10500010109982.

It is an arithmetic number, because the mean of its divisors is an integer number (10500010109982).

Almost surely, 2^{21000020219963} is an apocalyptic number.

21000020219963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000020219963 is an equidigital number, since it uses as much as digits as its factorization.

21000020219963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

Adding to 21000020219963 its reverse (36991202000012), we get a palindrome (57991222219975).

The spelling of 21000020219963 in words is "twenty-one trillion, twenty million, two hundred nineteen thousand, nine hundred sixty-three".