21411634 has 4 divisors (see below), whose sum is σ = 32117454. Its totient is φ = 10705816.

The previous prime is 21411623. The next prime is 21411661. The reversal of 21411634 is 43611412.

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., 15186609 + 6225025 = 3897^2 + 2495^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5352907 + ... + 5352910.

Almost surely, 2^21411634 is an apocalyptic number.

21411634 is a deficient number, since it is larger than the sum of its proper divisors (10705820).

21411634 is a wasteful number, since it uses less digits than its factorization.

21411634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10705819.

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

The square root of 21411634 is about 4627.2706858363. The cubic root of 21411634 is about 277.6834120112.

The spelling of 21411634 in words is "twenty-one million, four hundred eleven thousand, six hundred thirty-four".