21422410 has 8 divisors (see below), whose sum is σ = 38560356. Its totient is φ = 8568960.

The previous prime is 21422399. The next prime is 21422411. The reversal of 21422410 is 1422412.

It can be written as a sum of positive squares in 2 ways, for example, as 17631601 + 3790809 = 4199^2 + 1947^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21422411) 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, 1071111 + ... + 1071130.

Almost surely, 2^21422410 is an apocalyptic number.

21422410 is a deficient number, since it is larger than the sum of its proper divisors (17137946).

21422410 is a wasteful number, since it uses less digits than its factorization.

21422410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142248.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21422410 is about 4628.4349406684. The cubic root of 21422410 is about 277.7299881638.

Adding to 21422410 its reverse (1422412), we get a palindrome (22844822).

The spelling of 21422410 in words is "twenty-one million, four hundred twenty-two thousand, four hundred ten".