21625143 has 4 divisors (see below), whose sum is σ = 28833528. Its totient is φ = 14416760.

The previous prime is 21625117. The next prime is 21625181. The reversal of 21625143 is 34152612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21625143 - 2⁵ = 21625111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625103) 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, 3604188 + ... + 3604193.

It is an arithmetic number, because the mean of its divisors is an integer number (7208382).

Almost surely, 2^21625143 is an apocalyptic number.

21625143 is a deficient number, since it is larger than the sum of its proper divisors (7208385).

21625143 is an equidigital number, since it uses as much as digits as its factorization.

21625143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7208384.

The product of its digits is 1440, while the sum is 24.

The square root of 21625143 is about 4650.2841848644. The cubic root of 21625143 is about 278.6033468828.

Adding to 21625143 its reverse (34152612), we get a palindrome (55777755).

The spelling of 21625143 in words is "twenty-one million, six hundred twenty-five thousand, one hundred forty-three".