21112019 has 2 divisors, whose sum is σ = 21112020. Its totient is φ = 21112018.

The previous prime is 21112009. The next prime is 21112031. The reversal of 21112019 is 91021112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112019 - 2¹² = 21107923 is a prime.

It is a super-2 number, since 2×21112019² = 891434692512722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111988 and 21112006.

It is not a weakly prime, because it can be changed into another prime (21112009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556009 + 10556010.

It is an arithmetic number, because the mean of its divisors is an integer number (10556010).

Almost surely, 2^21112019 is an apocalyptic number.

21112019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112019 is an equidigital number, since it uses as much as digits as its factorization.

21112019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 21112019 is about 4594.7817140752. The cubic root of 21112019 is about 276.3821065765.

The spelling of 21112019 in words is "twenty-one million, one hundred twelve thousand, nineteen".