21831034 has 4 divisors (see below), whose sum is σ = 32746554. Its totient is φ = 10915516.

The previous prime is 21831023. The next prime is 21831041. The reversal of 21831034 is 43013812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21650409 + 180625 = 4653^2 + 425^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21830996 and 21831014.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5457757 + ... + 5457760.

Almost surely, 2^21831034 is an apocalyptic number.

21831034 is a deficient number, since it is larger than the sum of its proper divisors (10915520).

21831034 is a wasteful number, since it uses less digits than its factorization.

21831034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10915519.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21831034 is about 4672.3692063021. The cubic root of 21831034 is about 279.4847411726.

Adding to 21831034 its reverse (43013812), we get a palindrome (64844846).

The spelling of 21831034 in words is "twenty-one million, eight hundred thirty-one thousand, thirty-four".