21338055 has 48 divisors (see below), whose sum is σ = 38918880. Its totient is φ = 10800384.

The previous prime is 21338039. The next prime is 21338059. The reversal of 21338055 is 55083312.

It is not a de Polignac number, because 21338055 - 2⁴ = 21338039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338059) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108217 + ... + 108413.

It is an arithmetic number, because the mean of its divisors is an integer number (810810).

Almost surely, 2^21338055 is an apocalyptic number.

21338055 is a deficient number, since it is larger than the sum of its proper divisors (17580825).

21338055 is a wasteful number, since it uses less digits than its factorization.

21338055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 21338055 is about 4619.3132606482. The cubic root of 21338055 is about 277.3649696110.

The spelling of 21338055 in words is "twenty-one million, three hundred thirty-eight thousand, fifty-five".