30021919 has 8 divisors (see below), whose sum is σ = 32622080. Its totient is φ = 27523800.

The previous prime is 30021899. The next prime is 30021941. The reversal of 30021919 is 91912003.

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 30021919 - 2¹³ = 30013727 is a prime.

It is a super-2 number, since 2×30021919² = 1802631240885122, 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 = 30021893 and 30021902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30001919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24897 + ... + 26074.

It is an arithmetic number, because the mean of its divisors is an integer number (4077760).

Almost surely, 2^30021919 is an apocalyptic number.

30021919 is a deficient number, since it is larger than the sum of its proper divisors (2600161).

30021919 is a wasteful number, since it uses less digits than its factorization.

30021919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51021.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 30021919 is about 5479.2261314897. The cubic root of 30021919 is about 310.7989070941.

The spelling of 30021919 in words is "thirty million, twenty-one thousand, nine hundred nineteen".