21262246 has 4 divisors (see below), whose sum is σ = 31893372. Its totient is φ = 10631122.

The previous prime is 21262237. The next prime is 21262247. The reversal of 21262246 is 64226212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21262246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21262247) by changing a digit.

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 as a sum of consecutive naturals, namely, 5315560 + ... + 5315563.

It is an arithmetic number, because the mean of its divisors is an integer number (7973343).

Almost surely, 2^21262246 is an apocalyptic number.

21262246 is a deficient number, since it is larger than the sum of its proper divisors (10631126).

21262246 is a wasteful number, since it uses less digits than its factorization.

21262246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10631125.

The product of its digits is 2304, while the sum is 25.

The square root of 21262246 is about 4611.1003025308. The cubic root of 21262246 is about 277.0361094085.

Adding to 21262246 its reverse (64226212), we get a palindrome (85488458).

The spelling of 21262246 in words is "twenty-one million, two hundred sixty-two thousand, two hundred forty-six".