21273634 has 8 divisors (see below), whose sum is σ = 32143788. Its totient is φ = 10559040.

The previous prime is 21273611. The next prime is 21273641. The reversal of 21273634 is 43637212.

It can be written as a sum of positive squares in 2 ways, for example, as 20223009 + 1050625 = 4497^2 + 1025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38547 + ... + 39094.

Almost surely, 2^21273634 is an apocalyptic number.

21273634 is a deficient number, since it is larger than the sum of its proper divisors (10870154).

21273634 is a wasteful number, since it uses less digits than its factorization.

21273634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77780.

The product of its digits is 6048, while the sum is 28.

The square root of 21273634 is about 4612.3349834981. The cubic root of 21273634 is about 277.0855605050.

The spelling of 21273634 in words is "twenty-one million, two hundred seventy-three thousand, six hundred thirty-four".