21374238 has 8 divisors (see below), whose sum is σ = 42748488. Its totient is φ = 7124744.

The previous prime is 21374233. The next prime is 21374267. The reversal of 21374238 is 83247312.

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

21374238 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1781181 + ... + 1781192.

It is an arithmetic number, because the mean of its divisors is an integer number (5343561).

Almost surely, 2^21374238 is an apocalyptic number.

21374238 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21374238 is a wasteful number, since it uses less digits than its factorization.

21374238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3562378.

The product of its digits is 8064, while the sum is 30.

The square root of 21374238 is about 4623.2280930103. The cubic root of 21374238 is about 277.5216572660.

It can be divided in two parts, 21374 and 238, that added together give a palindrome (21612).

The spelling of 21374238 in words is "twenty-one million, three hundred seventy-four thousand, two hundred thirty-eight".