21327738 has 16 divisors (see below), whose sum is σ = 42771456. Its totient is φ = 7089920.

The previous prime is 21327727. The next prime is 21327751. The reversal of 21327738 is 83772312.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21327699 and 21327708.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2343 + ... + 6938.

It is an arithmetic number, because the mean of its divisors is an integer number (2673216).

Almost surely, 2^21327738 is an apocalyptic number.

21327738 is an abundant number, since it is smaller than the sum of its proper divisors (21443718).

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

21327738 is a wasteful number, since it uses less digits than its factorization.

21327738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9669.

The product of its digits is 14112, while the sum is 33.

The square root of 21327738 is about 4618.1964011939. The cubic root of 21327738 is about 277.3202601985.

It can be divided in two parts, 2132 and 7738, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 21327738 in words is "twenty-one million, three hundred twenty-seven thousand, seven hundred thirty-eight".