21374019 has 12 divisors (see below), whose sum is σ = 30961216. Its totient is φ = 14208912.

The previous prime is 21374011. The next prime is 21374021. The reversal of 21374019 is 91047312.

It is not a de Polignac number, because 21374019 - 2³ = 21374011 is a prime.

It is a super-2 number, since 2×21374019² = 913697376424722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21373983 and 21374001.

It is not an unprimeable number, because it can be changed into a prime (21374011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174 + ... + 6540.

Almost surely, 2^21374019 is an apocalyptic number.

21374019 is a deficient number, since it is larger than the sum of its proper divisors (9587197).

21374019 is a wasteful number, since it uses less digits than its factorization.

21374019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6746 (or 6743 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21374019 is about 4623.2044082000. The cubic root of 21374019 is about 277.5207094357.

The spelling of 21374019 in words is "twenty-one million, three hundred seventy-four thousand, nineteen".