21954229 has 8 divisors (see below), whose sum is σ = 24534720. Its totient is φ = 19471200.

The previous prime is 21954227. The next prime is 21954241. The reversal of 21954229 is 92245912.

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

It is a cyclic number.

It is not a de Polignac number, because 21954229 - 2¹ = 21954227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21954194 and 21954203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23889 + ... + 24790.

It is an arithmetic number, because the mean of its divisors is an integer number (3066840).

Almost surely, 2^21954229 is an apocalyptic number.

It is an amenable number.

21954229 is a deficient number, since it is larger than the sum of its proper divisors (2580491).

21954229 is a wasteful number, since it uses less digits than its factorization.

21954229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48731.

The product of its digits is 12960, while the sum is 34.

The square root of 21954229 is about 4685.5340143894. The cubic root of 21954229 is about 280.0094767201.

The spelling of 21954229 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred twenty-nine".