21426025 has 12 divisors (see below), whose sum is σ = 26944704. Its totient is φ = 16898000.

The previous prime is 21426023. The next prime is 21426047. The reversal of 21426025 is 52062412.

It is not a de Polignac number, because 21426025 - 2¹ = 21426023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21425987 and 21426005.

It is not an unprimeable number, because it can be changed into a prime (21426023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4261 + ... + 7810.

It is an arithmetic number, because the mean of its divisors is an integer number (2245392).

Almost surely, 2^21426025 is an apocalyptic number.

21426025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21426025 is a deficient number, since it is larger than the sum of its proper divisors (5518679).

21426025 is a wasteful number, since it uses less digits than its factorization.

21426025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12152 (or 12147 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21426025 is about 4628.8254449698. The cubic root of 21426025 is about 277.7456094600.

Adding to 21426025 its reverse (52062412), we get a palindrome (73488437).

The spelling of 21426025 in words is "twenty-one million, four hundred twenty-six thousand, twenty-five".