21020219963 has 2 divisors, whose sum is σ = 21020219964. Its totient is φ = 21020219962.

The previous prime is 21020219951. The next prime is 21020220037. The reversal of 21020219963 is 36991202012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020219963 - 2²⁰ = 21019171387 is a prime.

It is a super-3 number, since 3×21020219963³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21020219903) 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, 10510109981 + 10510109982.

It is an arithmetic number, because the mean of its divisors is an integer number (10510109982).

Almost surely, 2^21020219963 is an apocalyptic number.

21020219963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020219963 is an equidigital number, since it uses as much as digits as its factorization.

21020219963 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.

The spelling of 21020219963 in words is "twenty-one billion, twenty million, two hundred nineteen thousand, nine hundred sixty-three".