21850426 has 16 divisors (see below), whose sum is σ = 35378784. Its totient is φ = 10061424.

The previous prime is 21850393. The next prime is 21850429. The reversal of 21850426 is 62405812.

It is a super-2 number, since 2×21850426² = 954882232762952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21850394 and 21850403.

It is not an unprimeable number, because it can be changed into a prime (21850429) 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 in 7 ways as a sum of consecutive naturals, for example, 16065 + ... + 17371.

It is an arithmetic number, because the mean of its divisors is an integer number (2211174).

Almost surely, 2^21850426 is an apocalyptic number.

21850426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21850426 is a deficient number, since it is larger than the sum of its proper divisors (13528358).

21850426 is a wasteful number, since it uses less digits than its factorization.

21850426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21850426 is about 4674.4439241476. The cubic root of 21850426 is about 279.5674699483.

The spelling of 21850426 in words is "twenty-one million, eight hundred fifty thousand, four hundred twenty-six".