21714138 has 12 divisors (see below), whose sum is σ = 47047338. Its totient is φ = 7238040.

The previous prime is 21714137. The next prime is 21714149. The reversal of 21714138 is 83141712.

It can be written as a sum of positive squares in only one way, i.e., 17164449 + 4549689 = 4143^2 + 2133^2 .

It is not an unprimeable number, because it can be changed into a prime (21714137) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 603153 + ... + 603188.

Almost surely, 2^21714138 is an apocalyptic number.

21714138 is an abundant number, since it is smaller than the sum of its proper divisors (25333200).

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

21714138 is a wasteful number, since it uses less digits than its factorization.

21714138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206349 (or 1206346 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 21714138 is about 4659.8431304069. The cubic root of 21714138 is about 278.9850070950.

The spelling of 21714138 in words is "twenty-one million, seven hundred fourteen thousand, one hundred thirty-eight".