21211219963 has 2 divisors, whose sum is σ = 21211219964. Its totient is φ = 21211219962.

The previous prime is 21211219891. The next prime is 21211219973. The reversal of 21211219963 is 36991211212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211219963 - 2⁹ = 21211219451 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211219973) 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, 10605609981 + 10605609982.

It is an arithmetic number, because the mean of its divisors is an integer number (10605609982).

Almost surely, 2^21211219963 is an apocalyptic number.

21211219963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211219963 is an equidigital number, since it uses as much as digits as its factorization.

21211219963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The spelling of 21211219963 in words is "twenty-one billion, two hundred eleven million, two hundred nineteen thousand, nine hundred sixty-three".