21634141 has 4 divisors (see below), whose sum is σ = 22772800. Its totient is φ = 20495484.

The previous prime is 21634139. The next prime is 21634153. The reversal of 21634141 is 14143612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21634141 - 2¹ = 21634139 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569301 + ... + 569338.

It is an arithmetic number, because the mean of its divisors is an integer number (5693200).

Almost surely, 2^21634141 is an apocalyptic number.

It is an amenable number.

21634141 is a deficient number, since it is larger than the sum of its proper divisors (1138659).

21634141 is a wasteful number, since it uses less digits than its factorization.

21634141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138658.

The product of its digits is 576, while the sum is 22.

The square root of 21634141 is about 4651.2515520019. The cubic root of 21634141 is about 278.6419828554.

Adding to 21634141 its reverse (14143612), we get a palindrome (35777753).

The spelling of 21634141 in words is "twenty-one million, six hundred thirty-four thousand, one hundred forty-one".