21250626 has 24 divisors (see below), whose sum is σ = 44860464. Its totient is φ = 6710040.

The previous prime is 21250589. The next prime is 21250637. The reversal of 21250626 is 62605212.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21250596 and 21250605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2740 + ... + 7071.

It is an arithmetic number, because the mean of its divisors is an integer number (1869186).

Almost surely, 2^21250626 is an apocalyptic number.

21250626 is an abundant number, since it is smaller than the sum of its proper divisors (23609838).

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

21250626 is a wasteful number, since it uses less digits than its factorization.

21250626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854 (or 9835 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21250626 is about 4609.8401273797. The cubic root of 21250626 is about 276.9856326746.

Adding to 21250626 its reverse (62605212), we get a palindrome (83855838).

The spelling of 21250626 in words is "twenty-one million, two hundred fifty thousand, six hundred twenty-six".