21212022019 has 2 divisors, whose sum is σ = 21212022020. Its totient is φ = 21212022018.

The previous prime is 21212021959. The next prime is 21212022071. The reversal of 21212022019 is 91022021212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212022019 - 2⁷ = 21212021891 is a prime.

It is a super-2 number, since 2×21212022019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21212025019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606011009 + 10606011010.

It is an arithmetic number, because the mean of its divisors is an integer number (10606011010).

Almost surely, 2^21212022019 is an apocalyptic number.

21212022019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212022019 is an equidigital number, since it uses as much as digits as its factorization.

21212022019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21212022019 in words is "twenty-one billion, two hundred twelve million, twenty-two thousand, nineteen".