21496425 has 12 divisors (see below), whose sum is σ = 35540880. Its totient is φ = 11464720.

The previous prime is 21496417. The next prime is 21496463. The reversal of 21496425 is 52469412.

It is not a de Polignac number, because 21496425 - 2³ = 21496417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143235 + ... + 143384.

It is an arithmetic number, because the mean of its divisors is an integer number (2961740).

Almost surely, 2^21496425 is an apocalyptic number.

21496425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21496425 is a deficient number, since it is larger than the sum of its proper divisors (14044455).

21496425 is a wasteful number, since it uses less digits than its factorization.

21496425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286632 (or 286627 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 21496425 is about 4636.4237295571. The cubic root of 21496425 is about 278.0494753481.

The spelling of 21496425 in words is "twenty-one million, four hundred ninety-six thousand, four hundred twenty-five".