21212310019 has 2 divisors, whose sum is σ = 21212310020. Its totient is φ = 21212310018.

The previous prime is 21212309983. The next prime is 21212310037. The reversal of 21212310019 is 91001321212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212310019 - 2¹³ = 21212301827 is a prime.

It is a super-2 number, since 2×21212310019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21212310719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606155009 + 10606155010.

It is an arithmetic number, because the mean of its divisors is an integer number (10606155010).

Almost surely, 2^21212310019 is an apocalyptic number.

21212310019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212310019 is an equidigital number, since it uses as much as digits as its factorization.

21212310019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21212310019 in words is "twenty-one billion, two hundred twelve million, three hundred ten thousand, nineteen".