21634354 has 8 divisors (see below), whose sum is σ = 37087488. Its totient is φ = 9271860.

The previous prime is 21634337. The next prime is 21634399. The reversal of 21634354 is 45343612.

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

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 3 ways as a sum of consecutive naturals, for example, 772642 + ... + 772669.

It is an arithmetic number, because the mean of its divisors is an integer number (4635936).

Almost surely, 2^21634354 is an apocalyptic number.

21634354 is a deficient number, since it is larger than the sum of its proper divisors (15453134).

21634354 is a wasteful number, since it uses less digits than its factorization.

21634354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545320.

The product of its digits is 8640, while the sum is 28.

The square root of 21634354 is about 4651.2744490086. The cubic root of 21634354 is about 278.6428973135.

Adding to 21634354 its reverse (45343612), we get a palindrome (66977966).

The spelling of 21634354 in words is "twenty-one million, six hundred thirty-four thousand, three hundred fifty-four".