21634754 has 16 divisors (see below), whose sum is σ = 33878520. Its totient is φ = 10348800.

The previous prime is 21634741. The next prime is 21634799. The reversal of 21634754 is 45743612.

It can be written as a sum of positive squares in 4 ways, for example, as 9138529 + 12496225 = 3023^2 + 3535^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21634754.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4904 + ... + 8204.

Almost surely, 2^21634754 is an apocalyptic number.

21634754 is a deficient number, since it is larger than the sum of its proper divisors (12243766).

21634754 is a wasteful number, since it uses less digits than its factorization.

21634754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3445.

The product of its digits is 20160, while the sum is 32.

The square root of 21634754 is about 4651.3174477776. The cubic root of 21634754 is about 278.6446145896.

The spelling of 21634754 in words is "twenty-one million, six hundred thirty-four thousand, seven hundred fifty-four".