21425262 has 8 divisors (see below), whose sum is σ = 42850536. Its totient is φ = 7141752.

The previous prime is 21425251. The next prime is 21425269. The reversal of 21425262 is 26252412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21425262 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1785433 + ... + 1785444.

It is an arithmetic number, because the mean of its divisors is an integer number (5356317).

Almost surely, 2^21425262 is an apocalyptic number.

21425262 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21425262 is a wasteful number, since it uses less digits than its factorization.

21425262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570882.

The product of its digits is 1920, while the sum is 24.

The square root of 21425262 is about 4628.7430259197. The cubic root of 21425262 is about 277.7423124973.

Adding to 21425262 its reverse (26252412), we get a palindrome (47677674).

The spelling of 21425262 in words is "twenty-one million, four hundred twenty-five thousand, two hundred sixty-two".