21634327 has 8 divisors (see below), whose sum is σ = 25416720. Its totient is φ = 18154560.

The previous prime is 21634309. The next prime is 21634337. The reversal of 21634327 is 72343612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21634327 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21634295 and 21634304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75502 + ... + 75787.

It is an arithmetic number, because the mean of its divisors is an integer number (3177090).

Almost surely, 2^21634327 is an apocalyptic number.

21634327 is a deficient number, since it is larger than the sum of its proper divisors (3782393).

21634327 is a wasteful number, since it uses less digits than its factorization.

21634327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151313.

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

The square root of 21634327 is about 4651.2715465773. The cubic root of 21634327 is about 278.6427813966.

Adding to 21634327 its reverse (72343612), we get a palindrome (93977939).

It can be divided in two parts, 2163 and 4327, that multiplied together give a triangular number (9359301 = T₄₃₂₆).

The spelling of 21634327 in words is "twenty-one million, six hundred thirty-four thousand, three hundred twenty-seven".