21339093 has 16 divisors (see below), whose sum is σ = 28901376. Its totient is φ = 14003760.

The previous prime is 21339091. The next prime is 21339103. The reversal of 21339093 is 39093312.

It is not a de Polignac number, because 21339093 - 2¹ = 21339091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21339093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21339091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95580 + ... + 95802.

It is an arithmetic number, because the mean of its divisors is an integer number (1806336).

Almost surely, 2^21339093 is an apocalyptic number.

It is an amenable number.

21339093 is a deficient number, since it is larger than the sum of its proper divisors (7562283).

21339093 is a wasteful number, since it uses less digits than its factorization.

21339093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 21339093 is about 4619.4256136451. The cubic root of 21339093 is about 277.3694670557.

The spelling of 21339093 in words is "twenty-one million, three hundred thirty-nine thousand, ninety-three".