21926425 has 6 divisors (see below), whose sum is σ = 27188798. Its totient is φ = 17541120.

The previous prime is 21926419. The next prime is 21926441. The reversal of 21926425 is 52462912.

It can be written as a sum of positive squares in 3 ways, for example, as 7203856 + 14722569 = 2684^2 + 3837^2 .

It is not a de Polignac number, because 21926425 - 2¹³ = 21918233 is a prime.

It is a super-2 number, since 2×21926425² = 961536226561250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 438504 + ... + 438553.

Almost surely, 2^21926425 is an apocalyptic number.

21926425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21926425 is a deficient number, since it is larger than the sum of its proper divisors (5262373).

21926425 is an equidigital number, since it uses as much as digits as its factorization.

21926425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877067 (or 877062 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 21926425 is about 4682.5660700091. The cubic root of 21926425 is about 279.8912204999.

The spelling of 21926425 in words is "twenty-one million, nine hundred twenty-six thousand, four hundred twenty-five".