21263422 has 4 divisors (see below), whose sum is σ = 31895136. Its totient is φ = 10631710.

The previous prime is 21263399. The next prime is 21263443. The reversal of 21263422 is 22436212.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21263393 and 21263402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5315854 + ... + 5315857.

It is an arithmetic number, because the mean of its divisors is an integer number (7973784).

Almost surely, 2^21263422 is an apocalyptic number.

21263422 is a deficient number, since it is larger than the sum of its proper divisors (10631714).

21263422 is a wasteful number, since it uses less digits than its factorization.

21263422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10631713.

The product of its digits is 1152, while the sum is 22.

The square root of 21263422 is about 4611.2278191388. The cubic root of 21263422 is about 277.0412168724.

Adding to 21263422 its reverse (22436212), we get a palindrome (43699634).

The spelling of 21263422 in words is "twenty-one million, two hundred sixty-three thousand, four hundred twenty-two".