21934019 has 8 divisors (see below), whose sum is σ = 23626752. Its totient is φ = 20302920.

The previous prime is 21934013. The next prime is 21934039. The reversal of 21934019 is 91043912.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21934019 - 2²⁰ = 20885443 is a prime.

It is a super-2 number, since 2×21934019² = 962202378984722, 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 = 21933982 and 21934000.

It is not an unprimeable number, because it can be changed into a prime (21934013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14669 + ... + 16094.

It is an arithmetic number, because the mean of its divisors is an integer number (2953344).

Almost surely, 2^21934019 is an apocalyptic number.

21934019 is a deficient number, since it is larger than the sum of its proper divisors (1692733).

21934019 is a wasteful number, since it uses less digits than its factorization.

21934019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30817.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 21934019 is about 4683.3768799873. The cubic root of 21934019 is about 279.9235292871.

The spelling of 21934019 in words is "twenty-one million, nine hundred thirty-four thousand, nineteen".