21159193 has 8 divisors (see below), whose sum is σ = 23226336. Its totient is φ = 19116000.

The previous prime is 21159181. The next prime is 21159211. The reversal of 21159193 is 39195112.

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 21159193 - 2⁵ = 21159161 is a prime.

It is a super-2 number, since 2×21159193² = 895422896822498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21159133) 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, 4108 + ... + 7693.

It is an arithmetic number, because the mean of its divisors is an integer number (2903292).

Almost surely, 2^21159193 is an apocalyptic number.

It is an amenable number.

21159193 is a deficient number, since it is larger than the sum of its proper divisors (2067143).

21159193 is a wasteful number, since it uses less digits than its factorization.

21159193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11975.

The product of its digits is 2430, while the sum is 31.

The square root of 21159193 is about 4599.9122817723. The cubic root of 21159193 is about 276.5878085280.

The spelling of 21159193 in words is "twenty-one million, one hundred fifty-nine thousand, one hundred ninety-three".