21050634 has 16 divisors (see below), whose sum is σ = 45928800. Its totient is φ = 6378960.

The previous prime is 21050629. The next prime is 21050677. The reversal of 21050634 is 43605012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21050634.

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, 159409 + ... + 159540.

It is an arithmetic number, because the mean of its divisors is an integer number (2870550).

Almost surely, 2^21050634 is an apocalyptic number.

21050634 is an abundant number, since it is smaller than the sum of its proper divisors (24878166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21050634 is a wasteful number, since it uses less digits than its factorization.

21050634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318965.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21050634 is about 4588.0969911282. The cubic root of 21050634 is about 276.1139783393.

Adding to 21050634 its reverse (43605012), we get a palindrome (64655646).

The spelling of 21050634 in words is "twenty-one million, fifty thousand, six hundred thirty-four".