21020212019 has 2 divisors, whose sum is σ = 21020212020. Its totient is φ = 21020212018.

The previous prime is 21020211983. The next prime is 21020212021. The reversal of 21020212019 is 91021202012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020212019 is a prime.

It is a super-2 number, since 2×21020212019² (a number of 21 digits) contains 22 as substring.

Together with 21020212021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21020212099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510106009 + 10510106010.

It is an arithmetic number, because the mean of its divisors is an integer number (10510106010).

Almost surely, 2^21020212019 is an apocalyptic number.

21020212019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020212019 is an equidigital number, since it uses as much as digits as its factorization.

21020212019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21020212019 in words is "twenty-one billion, twenty million, two hundred twelve thousand, nineteen".