21922430 has 8 divisors (see below), whose sum is σ = 39460392. Its totient is φ = 8768968.

The previous prime is 21922429. The next prime is 21922501. The reversal of 21922430 is 3422912.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21922396 and 21922405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096112 + ... + 1096131.

It is an arithmetic number, because the mean of its divisors is an integer number (4932549).

Almost surely, 2^21922430 is an apocalyptic number.

21922430 is a deficient number, since it is larger than the sum of its proper divisors (17537962).

21922430 is a wasteful number, since it uses less digits than its factorization.

21922430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192250.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21922430 is about 4682.1394682346. The cubic root of 21922430 is about 279.8742207178.

The spelling of 21922430 in words is "twenty-one million, nine hundred twenty-two thousand, four hundred thirty".