21349238 has 8 divisors (see below), whose sum is σ = 32209488. Its totient is φ = 10612744.

The previous prime is 21349219. The next prime is 21349243. The reversal of 21349238 is 83294312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30506 + ... + 31197.

It is an arithmetic number, because the mean of its divisors is an integer number (4026186).

Almost surely, 2^21349238 is an apocalyptic number.

21349238 is a deficient number, since it is larger than the sum of its proper divisors (10860250).

21349238 is a wasteful number, since it uses less digits than its factorization.

21349238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61878.

The product of its digits is 10368, while the sum is 32.

The square root of 21349238 is about 4620.5235634071. The cubic root of 21349238 is about 277.4134156189.

The spelling of 21349238 in words is "twenty-one million, three hundred forty-nine thousand, two hundred thirty-eight".