21373738 has 8 divisors (see below), whose sum is σ = 32091300. Its totient is φ = 10676640.

The previous prime is 21373717. The next prime is 21373771. The reversal of 21373738 is 83737312.

It can be written as a sum of positive squares in 2 ways, for example, as 17698849 + 3674889 = 4207^2 + 1917^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2163 + ... + 6886.

Almost surely, 2^21373738 is an apocalyptic number.

21373738 is a deficient number, since it is larger than the sum of its proper divisors (10717562).

21373738 is a wasteful number, since it uses less digits than its factorization.

21373738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232.

The product of its digits is 21168, while the sum is 34.

The square root of 21373738 is about 4623.1740179232. The cubic root of 21373738 is about 277.5194932604.

The spelling of 21373738 in words is "twenty-one million, three hundred seventy-three thousand, seven hundred thirty-eight".