21093331 has 8 divisors (see below), whose sum is σ = 24136704. Its totient is φ = 18057480.

The previous prime is 21093313. The next prime is 21093377. The reversal of 21093331 is 13339012.

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

It is not a de Polignac number, because 21093331 - 2²³ = 12704723 is a prime.

It is a super-2 number, since 2×21093331² = 889857225351122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21093301) 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, 6846 + ... + 9436.

It is an arithmetic number, because the mean of its divisors is an integer number (3017088).

Almost surely, 2^21093331 is an apocalyptic number.

21093331 is a deficient number, since it is larger than the sum of its proper divisors (3043373).

21093331 is a wasteful number, since it uses less digits than its factorization.

21093331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3761.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 21093331 is about 4592.7476525496. The cubic root of 21093331 is about 276.3005329232.

The spelling of 21093331 in words is "twenty-one million, ninety-three thousand, three hundred thirty-one".