21101834 has 16 divisors (see below), whose sum is σ = 34209672. Its totient is φ = 9704448.

The previous prime is 21101819. The next prime is 21101849. The reversal of 21101834 is 43810112.

It is an interprime number because it is at equal distance from previous prime (21101819) and next prime (21101849).

It can be written as a sum of positive squares in 4 ways, for example, as 8392609 + 12709225 = 2897^2 + 3565^2 .

It is a Curzon number.

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, 6842 + ... + 9434.

Almost surely, 2^21101834 is an apocalyptic number.

21101834 is a deficient number, since it is larger than the sum of its proper divisors (13107838).

21101834 is a wasteful number, since it uses less digits than its factorization.

21101834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 21101834 is about 4593.6732578624. The cubic root of 21101834 is about 276.3376547322.

Adding to 21101834 its reverse (43810112), we get a palindrome (64911946).

The spelling of 21101834 in words is "twenty-one million, one hundred one thousand, eight hundred thirty-four".