21444629 has 4 divisors (see below), whose sum is σ = 21716160. Its totient is φ = 21173100.

The previous prime is 21444613. The next prime is 21444641. The reversal of 21444629 is 92644412.

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 21444629 - 2⁴ = 21444613 is a prime.

It is a super-2 number, since 2×21444629² = 919744225895282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21444595 and 21444604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444649) by changing a digit.

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, 135647 + ... + 135804.

It is an arithmetic number, because the mean of its divisors is an integer number (5429040).

Almost surely, 2^21444629 is an apocalyptic number.

It is an amenable number.

21444629 is a deficient number, since it is larger than the sum of its proper divisors (271531).

21444629 is an equidigital number, since it uses as much as digits as its factorization.

21444629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271530.

The product of its digits is 13824, while the sum is 32.

The square root of 21444629 is about 4630.8345900064. The cubic root of 21444629 is about 277.8259741023.

The spelling of 21444629 in words is "twenty-one million, four hundred forty-four thousand, six hundred twenty-nine".