21292422 has 8 divisors (see below), whose sum is σ = 42584856. Its totient is φ = 7097472.

The previous prime is 21292417. The next prime is 21292423. The reversal of 21292422 is 22429212.

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

21292422 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21292392 and 21292401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21292423) 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, 1774363 + ... + 1774374.

It is an arithmetic number, because the mean of its divisors is an integer number (5323107).

Almost surely, 2^21292422 is an apocalyptic number.

21292422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21292422 is a wasteful number, since it uses less digits than its factorization.

21292422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548742.

The product of its digits is 1152, while the sum is 24.

The square root of 21292422 is about 4614.3712464430. The cubic root of 21292422 is about 277.1671067000.

The spelling of 21292422 in words is "twenty-one million, two hundred ninety-two thousand, four hundred twenty-two".