21422463 has 8 divisors (see below), whose sum is σ = 28599168. Its totient is φ = 14263704.

The previous prime is 21422461. The next prime is 21422473. The reversal of 21422463 is 36422412.

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

It is not a de Polignac number, because 21422463 - 2¹ = 21422461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422461) 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, 1395 + ... + 6692.

It is an arithmetic number, because the mean of its divisors is an integer number (3574896).

Almost surely, 2^21422463 is an apocalyptic number.

21422463 is a deficient number, since it is larger than the sum of its proper divisors (7176705).

21422463 is an equidigital number, since it uses as much as digits as its factorization.

21422463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8973.

The product of its digits is 2304, while the sum is 24.

The square root of 21422463 is about 4628.4406661423. The cubic root of 21422463 is about 277.7302172024.

Adding to 21422463 its reverse (36422412), we get a palindrome (57844875).

The spelling of 21422463 in words is "twenty-one million, four hundred twenty-two thousand, four hundred sixty-three".