21619093 has 8 divisors (see below), whose sum is σ = 23032800. Its totient is φ = 20233008.

The previous prime is 21619051. The next prime is 21619109. The reversal of 21619093 is 39091612.

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 21619093 - 2⁹ = 21618581 is a prime.

It is a super-3 number, since 3×21619093³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21619043) 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, 5278 + ... + 8431.

It is an arithmetic number, because the mean of its divisors is an integer number (2879100).

Almost surely, 2^21619093 is an apocalyptic number.

It is an amenable number.

21619093 is a deficient number, since it is larger than the sum of its proper divisors (1413707).

21619093 is a wasteful number, since it uses less digits than its factorization.

21619093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13811.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 21619093 is about 4649.6336414819. The cubic root of 21619093 is about 278.5773631246.

The spelling of 21619093 in words is "twenty-one million, six hundred nineteen thousand, ninety-three".