21419738 has 16 divisors (see below), whose sum is σ = 32882760. Its totient is φ = 10460736.

The previous prime is 21419737. The next prime is 21419747. The reversal of 21419738 is 83791412.

It can be written as a sum of positive squares in 4 ways, for example, as 21409129 + 10609 = 4627^2 + 103^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21419698 and 21419707.

It is not an unprimeable number, because it can be changed into a prime (21419731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41828 + ... + 42336.

Almost surely, 2^21419738 is an apocalyptic number.

21419738 is a deficient number, since it is larger than the sum of its proper divisors (11463022).

21419738 is a wasteful number, since it uses less digits than its factorization.

21419738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961.

The product of its digits is 12096, while the sum is 35.

The square root of 21419738 is about 4628.1462811800. The cubic root of 21419738 is about 277.7184406709.

The spelling of 21419738 in words is "twenty-one million, four hundred nineteen thousand, seven hundred thirty-eight".